Answer: a) corporate bonds
Explanation: Money market instruments are short-term debt securities that typically have maturities of one year or less. They are used by borrowers and lenders to meet short-term financing needs. On the list provided, corporate bonds are considered long-term instruments, as they usually have maturities exceeding one year. In contrast, banker’s acceptances, treasury bills, and commercial paper are all classified as money market instruments due to their short-term nature and liquidity.