The statement "the limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte" corresponds to the law

Kohlrausch Law of Independent Migration of Ions

The correct answer is Option (3) → Kohlrausch Law of Independent Migration of Ions

The statement that “the limiting molar conductivity of an electrolyte is equal to the sum of the individual contributions of the cation and anion” is precisely the Kohlrausch Law of Independent Migration of Ions.

Mathematically:

$\Lambda_m^{0} = \lambda_+^{0} + \lambda_-^{0}$

This law states that at infinite dilution, ions migrate independently of each other, and each ion contributes a definite value to the total molar conductivity.