Refer to the given figures of a bacterial cell and Nostoc and choose the option which shows the correct labels for the structures marked as $A$,$B$,$C$,$D$,and $E$.

• A
  $A$ - Cell wall,$B$ - Cell membrane,$C$ - $DNA$,$D$ - Heterocyst,$E$ - Mucilaginous sheath
• B
  $A$ - Cell wall,$B$ - Cell membrane,$C$ - Heterocyst,$D$ - $DNA$,$E$ - Mucilaginous sheath
• C
  $A$ - Cell wall,$B$ - Cell membrane,$C$ - Mucilaginous sheath,$D$ - Heterocyst,$E$ - $DNA$
• D
  $A$ - Cell membrane,$B$ - Cell wall,$C$ - $DNA$,$D$ - Heterocyst,$E$ - Mucilaginous sheath