The Fund seeks to track the investment results of its Index. The Index is designed to broadly capture the U.S. investment grade fixed income market, as represented by the ICE BofA U.S. Broad Market Index (the Base Index). Unlike the Base Index, the Index does not weight component securities by market capitalization. Instead, the Index first assigns component securities from the Base Index into a variety of categories based upon asset class, sector, credit quality, duration and maturity. The Index then employs a rules-based methodology to allocate higher weights to categories with the potential for higher yields than the Base Index while seeking to maintain risk and credit quality at levels similar to those of the Base Index by limiting the amount of deviation between the two indices with respect to sector and category weights, tracking error, duration, and turnover. After the Index assigns a weight to each category (negative weights for a category are not permitted), individual component securities within each category are weighted based on their relative market capitalizations. The Base Index and Index are both rebalanced and reconstituted on a monthly basis. As of October 31, 2023, the Index was comprised of 11,476 securities..