The correct option is A Regulation Q, which is no longer in existence
Money market funds were a financial innovation partly inspired to circumvent regulation Q, which is no longer in existence. The money market is a market for
short-term funds which deals in monetary assets whose period of maturity
is up to one year. Generally money market is the source of finance for
working capital. Transactions of money market include lending and
borrowing of cash for a short period of time and also sale and purchase
of securities having one year time.