An octahedral complex of $Co^{3+}$ is diamagnetic. The hybridisation involved in the formation of the complex is

In $[NiCl_4]^{2-}$,the number of unpaired electrons is

Which of the following configurations will show an outer orbital octahedral complex?

The hybridization of $Ag^+$ in the linear complex $[Ag(NH_3)_2]^+$ is

Given below are two statements :
Statement $I$: $[Ni(CN)_4]^{2-}$ is square planar and diamagnetic complex with $dsp^2$ hybridization for $Ni$ but $[Ni(CO)_4]$ is tetrahedral,diamagnetic and with $sp^3$ hybridization for $Ni$.
Statement $II$: $[NiCl_4]^{2-}$ and $[Ni(CO)_4]$ both have same $d$-electron configuration,have same geometry and are paramagnetic.
In light of the above statements,choose the correct answer from the options given below:

The correct statement among the following is: