Vanguard Long-Term Treasury Fund Investor Shares 

This fund primarily allocates at least 80% of its holdings to U.S. government-issued debt, encompassing Treasury bills, notes, and bonds, including inflation-protected securities. It may also broaden its portfolio to include other government-affiliated instruments, such as debt issued by federal agencies that are sponsored, guaranteed, or owned by the U.S. government. A crucial risk factor is the sensitivity to interest rate changes; both upward and downward shifts can lead to a depreciation in the value of the fund's bonds or a eventual decrease in its income stream. This investment option may appeal to those seeking regular interest income who are also prepared to tolerate considerable interest rate risk.