In which of the following the hybrid orbitals of the central atom have the same s-characters ? $(i)\;CH_4 \qquad (ii)\; Ni(CO) \qquad (iii)\;SF_4 \qquad (iv) [Ni(CN)_4]^{2-} $

Question

$(a)\;\text{(i),(ii) and (iii) } \\ (b)\;\text{(i),(ii) and (iv)} \\(c)\;\text{(i),(iii) and (iv) } \\(d)\;\text{(ii),(iii) and (iv)} $