The correct answer is B.

Choice A is incorrect. A clearing balance refers to the funds that a bank keeps in its account at a Federal Reserve Bank to meet its reserve requirement and clear financial transactions, not an agreement between a bank and its customer for fund transfers.

Choice C is incorrect. The legal reserve is the minimum amount of funds that a bank must hold as reserves, according to central banking regulations. It does not involve any contractual agreement with customers for transferring funds from their checking accounts.

Choice D is incorrect. Reserve maintenance refers to the process by which banks manage their required reserves, but it does not refer to any specific type of contractual agreement between a bank and its customer for fund transfers.

Things to Remember

• Sweep accounts are commonly used by banks to automatically transfer excess funds from a customer's checking account into a higher-interest investment option, such as a money market mutual fund.
• These accounts help customers earn a higher return on their idle funds while also helping banks meet reserve requirements more efficiently.
• Reserve requirements are set by central banks to ensure that banks have enough liquidity to cover withdrawals and other obligations.
• By utilizing sweep accounts, banks can optimize their liquidity management and potentially earn higher returns on customer funds.