Why Are Primary Active Transporters Many Times Called ATPases

Why are primary active transporters many times called ATPases?

A) They act as enzymes to release energy from ATP.
B) ATP is the universal currency to get work done in the cell.
C) They must first bind to an ATP molecule before binding any transported molecule.
D) They often breakdown ATP to AMP and pyrophosphate (an ATPase activity) .
E) ATP is synthesized during the reverse reaction and is named for that ability.