When the Na to power of ((+))/ K to power of ((+)) pump moves its bound molecules of Na to power of

When the Na to power of ((+))/ K to power of ((+)) pump moves its bound molecules of Na to power of ((+)) to the outside of the membrane, it
A) binds to ATP to release the energy required to power the return trip.
B) pumps more K to power of ((+)) back into the cell than the amount of Na to power of ((+)) that just came out.
C) releases the bound ATP to return to its normal confirmation.
D) cannot return to the inside empty-handed, so it must bind two K to power of ((+)) first.
E) immediately returns to the inside of the cell, ready to transport more Na to power of ((+)) back outside.