Which is correct option.
(A) $\left[ \mathrm { Ni } ( \mathrm { CN } ) _ { 4 } \right] ^ { 2 - }$ is paramagnetic while $[ \mathrm { NiCl } ] _ { 4 } { } ^ { 2 - }$ and $\left[ \mathrm { Ni } ( \mathrm { CO } ) _ { 4 } \right]$ are diamagnetic.
(B) $\left[ \mathrm { Ni } ( \mathrm { CN } ) _ { 4 } \right] ^ { 2 - }$ and $\left[ \mathrm { Ni } ( \mathrm { CO } ) _ { 4 } \right]$ are diamagnetic while $\left[ \mathrm { NiCl } _ { 4 } \right] ^ { 2 - }$ is paramagnetic.
(C) $\left[ \mathrm { NiCl } _ { 4 } \right] ^ { 2 - }$ and $\left[ \mathrm { Ni } ( \mathrm { CO } ) _ { 4 } \right]$ are paramagnetic while $\left[ \mathrm { NI } ( \mathrm { CN } ) _ { 4 } \right] ^ { 2 - }$ is diamagnetic.
(D) $\left[ \mathrm { NiCl } _ { 4 } \right] ^ { 2 - }$ and $\left[ \mathrm { Ni } ( \mathrm { CN } ) _ { 4 } \right] ^ { 2 - }$ are paramagnetic while $\left[ \mathrm { Ni } ( \mathrm { CO } ) _ { 4 } \right]$ is diamagnetic.