Coordination number of underlined or mentioned atom is greater than...

Coordination number of underlined or mentioned atom is greater than or equal to 4 in how many of the following? (i) $\mathrm{Na}_2 \underline{\mathrm{SiF}}_6$ (ii) Silicon in Silica (iii) $\mathrm{CaSiO}_3$ (where the silicate unit is cyclic trisilicate) (iv) Silicon (v) \left[\mathrm{Ag}\left(\mathrm{S}_2 \mathrm{O}_3\right)_2\right]^{3-}$(vi)$\mathrm{SO}_3{ }^{2-}$(vii)$\mathrm{H}_3 \mathrm{PO}_3$(viii)$\underline{\mathrm{N}}_2 \mathrm{O}_5$(ix)$\underline{B}_2 \mathrm{H}_6