(a) Liquid Funds
Liquid Funds are specialised forms of mutual funds that invest in extremely short-term fixed income/money market instruments and provide easy liquidity.
Source: Chapter 7, Types of Mutual Funds
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The passage clearly states that Liquid Funds/Money Market Funds "invest in highly liquid money market instruments" with investment periods "as short as a day." Debt/Income Funds invest in fixed-income instruments but are medium-to-long-term, not extremely short-term — a common distractor. PPF is not a mutual fund at all. Always link "extremely short-term" to Liquid Funds in MCQs.