Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to pay for gas [title] Drive to the gas station. [step] Park next to a gas pump with your gas tank filler facing the pump. [title] Turn off your engine.

Ending1: [step] This is the first step that will allow you to call for confirmation that gas is available. [title] Place a locked coin press on top of your gas tank spreader. Ending2: [step] Determine if the pump has power to charge your car. Your car cannot pump electricity at all if the power has been turned off. Ending3: [step] Turn off your headlights (if they are not already on). Use a hand signal (like a phone) to signal to the operator that you are about to release gas. Ending4: [title] Pay for the gas before you pump it. [step] If you're using a credit card, hand it to the attendant.

Answer format: ending1/ending2/ending3/ending4