In the first row high-spin transition metal complexes $\left[\mathrm{M}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$ with $\mathrm{d}^{5}$ and $\mathrm{d}^{7}$ metal ions, the d-d transitions are
(a)spin-forbidden for both
(b)spin-allowed for both
(c)spin-forbidden for $\mathrm{d}^{5}$ and spin-allowed for $\mathrm{d}^{7}$
(d)spin-allowed for $\mathrm{d}^{5}$ and spin-forbidden for $\mathrm{d}^{7}$