Strategy. In seeking to achieve the Portfolio's investment objective, the Portfolio's sub-adviser, Goldman Sachs Asset Management, L.P. ("GSAM" or the "Sub-Adviser"), invests, under normal circumstances, at least 80% of the Portfolio's net assets, plus any borrowings for investment purposes in fixed-income securities, including securities issued or guaranteed by the U.S. government, its agencies, instrumentalities or sponsored enterprises ("U.S. Government Securities"), corporate debt securities, collateralized loan obligations (limited to no more than 15% of the Portfolio's net assets), privately issued adjustable rate and fixed rate mortgage loans or other mortgage-related securities ("Mortgage-Backed Securities") and asset-backed securities. The Portfolio may also invest in custodial receipts, fixed-income securities issued by or on behalf of states, territories, and possessions of the United States (including the … Show more… In seeking to achieve the Portfolio's investment objective, the Portfolio's sub-adviser, Goldman Sachs Asset Management, L.P. ("GSAM" or the "Sub-Adviser"), invests, under normal circumstances, at least 80% of the Portfolio's net assets, plus any borrowings for investment purposes in fixed-income securities, including securities issued or guaranteed by the U.S. government, its agencies, instrumentalities or sponsored enterprises ("U.S. Government Securities"), corporate debt securities, collateralized loan obligations (limited to no more than 15% of the Portfolio's net assets), privately issued adjustable rate and fixed rate mortgage loans or other mortgage-related securities ("Mortgage-Backed Securities") and asset-backed securities. The Portfolio may also invest in custodial receipts, fixed-income securities issued by or on behalf of states, territories, and possessions of the United States (including the District of Columbia) ("Municipal Securities") and convertible securities. The Portfolio may also engage in forward foreign currency transactions for both hedging and non-hedging purposes. The Portfolio also intends to invest in derivatives, including (but not limited to) interest rate futures, interest rate swaps and credit default swaps, which are used primarily to hedge the Portfolio's portfolio risks, manage the Portfolio's duration and/or gain exposure to certain fixed-income securities or indices. The Portfolio may purchase or sell Mortgage-Backed Securities issued or guaranteed by U.S. government agencies or sponsored enterprises ("Agency Mortgage-Backed Securities") on a delayed delivery or forward commitment basis through the to-be-announced ("TBA") market. With TBA transactions, the particular securities to be delivered must meet specified terms and standards. The value of the Portfolio's investments in non-U.S. dollar denominated obligations (hedged or unhedged against currency risk) will not exceed 25% of its total assets measured at the time of purchase ("Total Assets") and 10% of the Portfolio's Total Assets may be invested in sovereign and corporate debt securities and other instruments of issuers in emerging market countries ("emerging countries debt"). Additionally, exposure to non-U.S. currencies (unhedged against currency risk) will not exceed 25% of the Portfolio's Total Assets. In pursuing its investment objective, the Portfolio uses the Bloomberg U.S. Aggregate Bond Index (the "Index") as its performance benchmark, but the Portfolio will not attempt to replicate the Index. The Portfolio may, therefore, invest in securities that are not included in the Index. The Portfolio may invest in fixed-income securities rated at least BBB or Baa3 at the time of purchase. Securities will either be rated by a nationally recognized statistical rating organization ("NRSRO") or, if unrated, determined by GSAM to be of comparable credit quality. After its purchase, a portfolio security may be assigned a lower rating or cease to be rated, which may affect the market value and liquidity of the security. If this occurs, the Portfolio may continue to hold the security if GSAM believes it is in the best interest of the Portfolio and its shareholders. The Portfolio's target duration range under normal interest rate conditions is expected to approximate that of the Index, plus or minus 1.5 years, and since the Portfolio's inception on November 1, 2017 through December 31, 2024, the duration of the Index has ranged between 5.59 and 6.53 years. "Duration" is a measure of a debt security's price sensitivity to changes in interest rates. The longer the duration of the Portfolio (or an individual debt security), the more sensitive its market price to changes in interest rates. For example, if market interest rates increase by 1%, the market price of a debt security with a positive duration of 3 years will generally decrease by approximately 3%. Conversely, a 1% decline in market interest rates will generally result in an increase of approximately 3% of that security's market price. The Sub-Adviser employs a fundamental investment process that may integrate traditional fundamental factors alongside environmental, social and governance ("ESG") factors. No one factor or consideration is determinative in the fundamental investment process. Show less