What is the best form of collateral (FD, MF, ETF) to get margin funding?

Most brokers don't accept fixed deposit so options left are A category shares or mutual funds or liquid bees or liquid etf
Among all these other options which gives at least 6% per annum ...I know shares and mutual funds you can not trust because market may go up and down but market can affect liquid bees and liquid etf returns as well ?
I mean is any of those 2 options are safe to get at least 6% return?

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