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Identify $A, B, C$ and $D$ parts in this diagram of bacteriophage.

• A
  $A$ - Head, $B$ - Sheath, $C$ - Collar, $D$ - Tail fibres
• ✓
  $A$ - Head, $B$ - Collar, $C$ - Sheath $D$ - Tail fibres
• C
  $A$ - Head ,$B$ - Collar ,$C$ - Tail fibres, $D$ - Sheath
• D
  $A$ -Head, $B$ -Sheath, $C$ - Tail fibres, $D$ - Collar