Assertion (A): A PI controller increases the order of the system by units but decreases the steady state error.Reason (R): A PI controller introduces a pole at either the origin or at a desired points on the negative real axis.

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