Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light. Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.

• Both A and R are correct and R is correct explanation of A
• Both A and R are correct but R is not correct explanation of A
• A is correct but R is wrong
• A is wrong but R is correct