Digestion of proteins is incomplete in the absence of enterokinase, because
(1) Trypsinogen is not converted into trypsin
(2) Pepsinogen is not converted into pepsin
(3) Prorennin is not converted into rennin
(4) Chymotrypsinogen is not converted into chymotrypsin
(1) Trypsinogen is not converted into trypsin