71. What is the stoichiometry of ion transport per ATP hydrolyzed by the Na⁺/K⁺ pump?
(A) 3 Na⁺ out / 2 K⁺ in
(B) 2 Na⁺ out / 2 K⁺ in
(C) 2 Na⁺ out / 3 K⁺ in
(D) 3 Na⁺ out / 3 K⁺ in

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