Colourless tetrahedral complexes among the following are

Neutral complex among the following

The tetrahedral complexes are

The paramagnetic and tetrahedral complexes among the following are - a-[NiCl_4]^(2-) , b-[CuCl_4]^(2-) , c-[Ni(CO)_4] , d-[Ni(CN)_4]^(2-)