When a certain price control is imposed on this market, the resulting quantity of the good that is actually bought and sold is such that buyers are willing and able to pay a maximum of P 1 dollars per unit for that quantity and sellers are willing and able to accept a minimum of P 2 dollars per unit for that quantity. If P 1 − P 2 = $3, then the price control is a. only a price ceiling of $3.00. b. only a price ceiling of $6.00. c. only a price floor of $6.00. d. either a price ceiling of $3.00 or a price floor of $6.00.