In what way do ETFs differ from mutual funds?

A key structural difference between ETFs and mutual funds is the ETF creation and redemption mechanism. ETF providers work with designated brokers or authorized dealers to create and redeem large blocks of ETF units, usually in exchange for baskets of securities or cash. This process helps keep the ETF’s market price close to its net asset value and supports secondary-market liquidity. Mutual fund investors generally purchase and redeem units directly through the fund company at net asset value, not through an exchange-based creation/redemption process. Options A and C are not unique ETF characteristics because both ETFs and mutual funds can hold liquid securities or emerging market investments. Option D may apply broadly to investment funds, so it is not the distinguishing feature.