Physics · Electrostatic Potential

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Electrostatic potential is constant throughout the volume of a charged conductor and has the same value on its surface. Reason (R): The electric field inside a conductor in electrostatic equilibrium is non-zero and perpendicular to its surface. In the light of the above statements, choose the correct answer from the options given below:

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. is true but (R) is false.
4. is false but (R) is true.