After corona, inflation has been rising. So if you want an investment option to fend off inflation with no risk, Series 1 saving bonds are for you. The payout is higher if the inflation is at a higher rate and vice versa. Though you can invest in these bonds for up to $10000 only, or you can levy your tax returns on this. You can only grab money out of these bonds after five years, or you will have to pay a fine.
These bonds save you from losing the purchasing power of money, which is a downside in all the options. You can buy them in the U.S Treasurery.