If the temperature of a metallic conductor is increased, then the product of resistivity and conductivity

remains same

The correct answer is Option (3) → remains same

For a conductor:

Resistivity: $\rho$

Conductivity: $\sigma = \frac{1}{\rho}$

Product: $\rho \cdot \sigma = \rho \cdot \frac{1}{\rho} = 1$

This is independent of temperature.

${\text{remains same}}$