Assertion (A): The stability of the system is assured if the ROC includes the unit circle in z-plane.Reason (R): For a causal stable system all the poles should be outside the unit circle in the z-plane.

• A. tBoth A and R are true and R is the correct explanation of A
• B. tBoth A and R are true bit R is NOT the correct explanation of A
• C. tA is true but R is false
• D. tA is false but R is true