Which Type of Proteins Are Involved in Nutrient Transport and Why

Which type of proteins are involved in nutrient transport and why?

A) integral proteins, because they span the membrane and thereby are able to carry nutrients across the membrane
B) peripheral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane
C) integral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane
D) peripheral proteins, because they span the membrane and thereby are able to carry nutrients across the membrane
E) both integral and peripheral proteins, because they can both span the membrane and thereby are able to carry nutrients across the membrane