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Among [Ni(CO)4],[Ni(CN)4]2-, [NiCl4]2- species, the hybridisation states of the Ni atom are, respectively (At. no. of Ni=28)

(a) sp3,dsp2.dsp2

(b) sp3,dsp2,sp3

(c) sp3,sp3,dsp2

(d) dsp2,sp3,sp3