Which is the best definition of active transport?

Question

Quizplus · Accepted Answer

Active transport is the movement of a substance against its concentration gradient, from an area of lower concentration to an area of higher concentration, which requires energy expenditure. This energy is often provided by ATP (adenosine triphosphate), a molecule that powers many cellular processes. This process allows cells to move molecules and ions across membranes and maintain the concentration gradients needed for cellular processes.

Which Is the Best Definition of Active Transport