Among the species given below, the spin-only magnetic moment is highest for (Given : Atomic number of \( \text{Ti} = 22 \), \( \text{Mn} = 25 \), \( \text{Fe} = 26 \) and \( \text{Co} = 27 \))

\( [\text{Mn}(\text{CN})_6]^{3-} \) has \( \text{Mn}^{3+} \) (\( d^4 \)) with strong field ligand \( \text{CN}^- \) resulting in 2 unpaired electrons, but let's check ligand fields: \( \text{Mn}^{3+} \) in \( [\text{Mn}(\text{CN})_6]^{3-} \) has \( t_{2g}^4 e_g^0 \) (2 unpaired). Wait, \( [\text{Fe}(\text{CN})_6]^{3-} \) has \( d^5 \) with 1 unpaired electron. \( [\text{Mn}(\text{CN})_6]^{3-} \) has higher unpaired electrons.