Which one of the following techniques is not ideal for immobilized cell free enzymes?

Q. Which one of the following techniques is not ideal for immobilized cell free enzymes?

A.            physical entrapment by encapsulation

B.            physical bonding by flocculation

C.            covalent chemical bonding by cross linking the precipitate

D.            covalent surface bonding to surface carriers

Answer: physical bonding by flocculation