Na⁺ is Released from Its Binding Site on the Na⁺

Na⁺ is released from its binding site on the Na⁺/ K⁺ pump as a result of the

A) enzyme on the inside of the cell which cleaves the Na⁺ from its binding site.
B) conformational change decreasing the affinity of the Na⁺ binding site.
C) interaction of the Na⁺ and K⁺ binding sites.
D) binding of K⁺ to its binding site.
E) exposure of the Na⁺ binding site to the inside of the cell.