Strategy. The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings made for investment purposes) in municipal securities that pay interest that is exempt from federal income tax. The Fund also invests, under normal circumstances, at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed income securities that are rated investment grade or equivalent by a nationally recognized statistical rating organization (NRSRO) or, if a security is unrated, that the Funds investment adviser considers to be of comparable quality. The investment adviser seeks to invest in federally tax-exempt municipal bond issues that have historically demonstrated lower degrees of credit volatility and consistent payment records … Show more… The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings made for investment purposes) in municipal securities that pay interest that is exempt from federal income tax. The Fund also invests, under normal circumstances, at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed income securities that are rated investment grade or equivalent by a nationally recognized statistical rating organization (NRSRO) or, if a security is unrated, that the Funds investment adviser considers to be of comparable quality. The investment adviser seeks to invest in federally tax-exempt municipal bond issues that have historically demonstrated lower degrees of credit volatility and consistent payment records compared to other municipal bond issues. Municipal bonds in which the Fund invest include general obligation issues, tax revenue issues, tollway and transportation issues, essential service revenue issues, and pre-refunded issues. The Fund may purchase municipal obligations on a when-issued or delayed delivery basis or enter into forward commitments to purchase municipal obligations. The Fund primarily invests in U.S. dollar denominated securities. The investment adviser intends to maintain in the Fund a minimum average overall portfolio quality rating of Aa3 by Moodys and/or AA- by Standard & Poors, excluding unrated securities. In managing the Funds portfolio, the investment adviser seeks to generally capture the attributes of the ICE BofA 1-12 Year AAA-AA Index (the ICE BofA Benchmark), including average effective duration, duration distribution of individual securities, quality, and convexity, while attempting to realize additional returns through sector allocation and security selection. The investment adviser seeks to manage the Funds portfolio-wide weighted average effective duration typically within +/- 20% of the effective duration of the ICE BofA Benchmark. Under certain market conditions, the Funds portfolio may have a longer or shorter weighted average effective duration. As of July 31, 2025, the effective duration of the ICE BofA Benchmark was 4.30. The investment adviser seeks to maintain the Funds portfolio-wide weighted average maturity between one to 12 years. The Fund may invest in other investment companies, such as mutual funds and exchange-traded funds. Show less