Poisons like cyanide inhibit `Na^(+)` efflux and `K^(+)` influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that
A. ATP is the carrier protein in the transport system
B. `Na^(+)_K^(+)` exchange pump operates in the cell
C. ATP is hydrolysed by ATP ase to release energy
D. Energy for `Na^(+)_K^(+)` exchange pump comes from ATP
