Assertion (A): An on-off controller gives rise to self-sustained oscillation in output.Reason (R): Location of a pair of poles on the imaginary axis gives to self-sustained oscillation is output.

• A. Both A and R true and R is correct explanation of A
• B. Both A and R are true but R is not correct explanation of A
• C. A is true and R is False
• D. A is False and R is True