which is best and safe ETF that can be used for collateral margin

Which is the best and safe ETC that I can use for collateral margin?
My broker said they don't accept fixed deposit for collateral margin for option selling.

They said we accept liquid ETF ...to my understanding there are only 3 ETF ..nippon(reliance), DSP and ICICI ..please correct me if I am wrong.
If so which is the best in terms of returns....
Are any of the returns close to 6% which is interest rate for fixed deposits?

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