Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?

${\text{CN}}^{-}$ is a strong field ligand, causing pairing of electrons.$[\text{Co}(\text{CN}{)}_6{]}^{3-}$: ${\text{Co}}^{3+}$ is $d^6$. In a strong field, all $6$ electrons pair up in the $t_{2g}$ orbitals. Unpaired electrons $(n)=0$.Since $n=0$, the magnetic moment is $0\text{BM}$, which is the lowest possible value.