Co-transport of nutrients across the intestinal cell membranes is an active process that can move glucose against a concentration gradient. The energy requiring step for co-transport:

A.	The Na+K+ATPase that pumps Na+ from the cell into the lumen of the intestine.
B.	The permease that allows glucose and Na+ into the cell requires ATP.
C.	The permease that pumps glucose from the cell into the blood requires ATP.
D.	The Na+K+ ATPase that pumps Na+ from the cell into the blood, maintaining low Na+ levels in the cell.