Coordination Compounds question bank (Chemistry)

Number of paramagnetic complexes among the following is ________.
$[\text{MnBr}_4]^{2-}$, $[\text{NiCl}_4]^{2-}$, $[\text{Ni(CN)}_4]^{2-}$, $[\text{Ni(CO)}_4]$, $[\text{CoF}_6]^{3-}$, $[\text{Fe(CN)}_6]^{4-}$, $[\text{Mn(CN)}_6]^{3-}$, $[\text{Ti(CN)}_6]^{3-}$, $[\text{Cu(H}_2\text{O)}_6]^{2+}$, $[\text{Co(C}_2\text{O}_4\text{)}_3]^{3-}$

Consider the metal complexes $[Ni(en)_3]^{2+}$ (A), $[NiCl_4]^{2-}$ (B) and $[Ni(NH_3)_6]^{2+}$ (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.