Which of the following statements about enzyme inhibition are correct?

 Which of the following statements about enzyme inhibition are correct?
1 ❏ Competitive inhibitors increase the Km of an enzyme without affecting Vmax
2 ❏ Non-competitive inhibitors bind only to the active site of the enzyme
3 ❏ Irreversible inhibition often involves covalent bonding between inhibitor and enzyme

Instructions:
Choose:
A ❏ if 1, 2, and 3 are correct
B ❏ if 1 and 2 only are correct
C ❏ if 2 and 3 only are correct
D ❏ if 1 only is correct
E ❏ if 3 only is correct