Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is
[At. nos. Ti = 22, V = 23, Cr = 24, Mn = 25]
(a) Ti3+, V2+, Cr3+, Mn4+
(b) Ti+, V2+, Cr3+, Mn4+
(c) Ti4+, V3+, Cr2+, Mn3+
(d) Ti2+, V3+, Cr4+, Mn5+