The First Step of the Na⁺/ K⁺ pump's Activity Involves

The first step of the Na⁺/ K⁺ pump's activity involves the binding of which of the following?

A) 3 Na⁺ and 2 K⁺ to their respective binding sites
B) 3 Na⁺ to their binding site on the inside of the cell
C) 3 Na⁺ to their binding site on the outside of the cell
D) 2 K⁺ to their binding site on the inside of the cell
E) 2 K⁺ to their binding site on the outside of the cell