Find the total number of correct orders among the following.

(a) Order of electron affinity : $\mathrm{S}>{\mathrm{O}}^{-}$

(b) Order of ionic radius : ${\mathrm{Al}}^{3+}<{\mathrm{Mg}}^{2+}<{\mathrm{O}}^{2-}$

(c) Order of electronegativity : Si $<\mathrm{P}<\mathrm{C}<\mathrm{N}$

(d) Order of atomic radius : $\mathrm{O}<\mathrm{C}<\mathrm{S}<\mathrm{Se}$

(e) Order of second ionization energy : $\mathrm{C}<\mathrm{N}<\mathrm{F}<0$

(f) Order of ionic radii : ${\mathrm{S}}^{2-}<{\mathrm{Cl}}^{-}<{\mathrm{K}}^{+}<{\mathrm{Ca}}^{2+}$