Statements about Enzyme Inhibitor Drugs are given below.
$A$. There are Competitive and Non-competitive inhibitor drugs.
$B$. These can bind at the active sites and allosteric sites.
$C$. Competitive Drugs are allosteric site blocking drugs.
$D$. Non-competitive Drugs are active site blocking drugs.
Choose the correct answer from the options given below.

• A
  $A, D$ only
• B
  $A, C$ only
• C
  $A, B$ only
• D
  $A, B, C$ only