In the first row high-spin transition metal complexes $\mathrm{[M(H_2O)_6]Cl_2}$ 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 $\mathrm{d^7}$