Can the not-invested SDIRA funds buy CD?

[Huiping S.]

One LLC bank account of SDIRA has extra cash which not enough or read to put on property yet, and the bank gives money market interests, which is under 2%. The banker said to get higher interest, such as 5% needs to buy business CD. Will this be a problem for IRA?

My understand is I can buy properties, buy any product of Wall Street, buy CD also. When I talked to Fidelity to open a small business bank account for SDIRA LLC, after almost one month they review the operation agreement, Fidelity told me NO and they will not deal with anything of IRA.

Can experience SDIRA investor share your valuable knowledge?

Thanks.