Objective: How do you microwave food?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
a). First, open the microwave door and insert your food inside the microwave. Close the microwave door and enter the amount of time you would like to microwave your food for. Once completed, press start to microwave your food.;
b). First, open the microwave door and insert your food inside the microwave. Close the microwave door and unplug the microwave. Once completed, press start to microwave your food.;
a).