Adelivery man pushes the button to ring the doorbell. which of the following forms of energy is not involved in this process

Of the following given choices;

The answer is; gravitational.

When the delivery man pushes the doorbell, he is utilizing mechanical energy. This energy is later converted to electrical energy that travels through a circuit to the inside of the house. An actuator then converts the electrical energy to sound that is heard inside the house.

probably not if net force is zero

i think its d if wrong im sorry