One group of students uses different methods to conserve water as listed below. method 1: close dripping faucets properly and fix leaking ones immediately. method 2: use the dishwasher when it is fully loaded. method 3: wash the car with recycled water. method 4: wash hands in a sink half full of water, and do not let the tap run. which of these methods does not use any extra water? a. method 2 and method 3 b. method 1 and method 3 c. method 2 and method 4 d. method 1 and method 2