Since sodium potassium pumps require an input of energy to operate they are an example of

Active Transport

Explanation:

There are different forms of transport when dealing with cells. There is active transport, and passive transport.

Passive transport occurs when no ATP is required to transport particles across the membrane barrier. This can be related to very small particles which can simply diffuse across the membrane.

Active transport does require ATP, and can be used to transport ions or other particles which cannot pass through the cell membrane unaided.

i believe the answer would be b. hope it : )