Ksp of salt AB, AB2, and A3B are 4.0x10⁻⁸, 3.2x10⁻¹⁴, and 2.7x10⁻¹⁵ respectively at temperature T. The solubility order of these salts in water at temperature T (in mol litre⁻¹) will be _____.

a) AB > AB2 > A3B
b) A3B > AB > AB2
c) AB2 > AB > A3B
d) AB > A3B > AB2