according to the crystal field theory, which one of the following compounds is an inner orbital complex?
Atomicnumber of Zn=30,Cr=24,Co=27,Ni=28
(A) [Zn(NH₃)₆]⁺²
(B) [Cr(NH₃)₆]⁺³
(C) [Co(NH₃)₆]⁺³
(D) [Ni(NH₃)₆]⁺²