$(a)\;12\qquad(b)\;6\qquad(c)\;8\qquad(d)\;4$

In three dimensional hexagonal close packing of crystals, the two dimensional hcp layers are arranged in ABAB...... pattern as shown below.

The atoms in A layers are exactly above one type of the trigonal voids in B layer.

The central atom in B layer is immediately surrounded by 12 atoms .

6 in layer B and 3 each in two A layers .

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