Consider the following statements. (a) [V(CO)6]− has higher metal-carbon bond strength than [Mn(CO)6]+. (b) The total possible isomers of [CrCl2(ox)2]3− are three. (c) The coordination numbers of Fe and Co in [Fe(C2O4)3]3− and [Co(en)3]3+ are 6 and 3, respectively. The correct statement(s) is/are