The fund invests under normal circumstances, at least 80% of its net assets in U.S. Treasury securities with remaining maturities of greater than or equal to 20 years and/or ETFs that invest at least 80% of their net assets in 20+ Treasuries and/or forwards,options or futures contracts linked to 20+ Treasuries; and (ii) selling and purchasing S&P 500® Index put options to generate income for the fund beyond what is received from the Underlying Investments.