The $N{a}^{+}/K^{+}$ pump is present in the plasma membrane of mammalian cells where it.

The Sodium-Potassium Pump is involved in the movement of the sodium and potassium ions across the cell membrane. In this process, ATP is hydrolyzed to liberate energy required for the transport. Hence the process is active that takes place with the help of $N{a}^{+}$/$K^{+}$-ATPase enzyme. In this sodium is expelled outside the cell and potassium is moved into the cell. Thus, the correct answer is option D.