$A$: Bacillus and Coccus types of bacteria are found in colonial forms.
$R$: In bacteria,cells formed by cell division remain surrounded by a secreted slimy substance.

• A
  $A$ and $R$ are both true and $R$ is the correct explanation of $A$.
• B
  $A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.
• C
  $A$ is true and $R$ is false.
• D
  $A$ is false and $R$ is true.