Answer is (4)
Number of octahedral and tetrahedral voids formed by 
closed packed atoms are and 
respectively.
Because each hexagonal unit cell has 6 atoms, there are 12 and 6 tetrahedral and octahedral voids, respectively.
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:
(1) 8,4
(2) 6,12
(3) 2,1
(4) 12,6
(1) 8,4
(2) 6,12
(3) 2,1
(4) 12,6
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:
(1) 8,4
(2) 6,12
(3) 2,1
(4) 12,6
(1) 8,4
(2) 6,12
(3) 2,1
(4) 12,6
![\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c5a91864ba7e1e0ed1b5d273d822f5e5_l3.png "Rendered by QuickLaTeX.com")
(b) ![\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ffda616d3dbe7dc8925722e87005924e_l3.png "Rendered by QuickLaTeX.com")
(c) ![\left[\mathrm{PdCl}_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-90cc6a4f4d42dee46e06d6f8ed516b7a_l3.png "Rendered by QuickLaTeX.com")
(d) ![\left[\mathrm{NiCl}_{4}\right]^{2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-149ee5c95bd9cfcc4405704fba2e1bab_l3.png "Rendered by QuickLaTeX.com")
(d) all of these