How Do Competitive and Noncompetitive Enzyme Inhibitors Differ from Each

How do competitive and noncompetitive enzyme inhibitors differ from each other?

A) Competitive inhibitors bind to the active site, whereas noncompetitive inhibitors change the shape of the active site.
B) Competitive inhibitors have a higher energy of activation than noncompetitive inhibitors have.
C) Noncompetitive enzyme inhibitors contain magnesium, whereas competitive inhibitors contain iron.
D) Noncompetitive enzyme inhibitors are reversible, whereas competitive inhibitors are irreversible.
E) They function at different pH values.