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The figure given below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D. 

A. A - Tail fibres B - Head C - Sheath D - Collar

B. A - Sheath B - Collar C - Head D - Tail fibres

C. A - Head B - Sheath C - Collar D - Tail fibres

D. A - Collar B - Tail fibres C - Head D - Sheath