Solubility product constant (Ksp) of salts of type MX, MX2 and MX3 at temperature 'T' are 4.0 x 10-8, 3.2 x 10-14 and 2.7 x 10-15, respectively. Solubilities (mol, dm-3) of the salt at temperature 'T' are in the order
(a) MX > MX2 > M3X
(b) M3X > MX2 > MX
(c) MX2 > M3X > MX
(d) MX > M3X > MX2