Assertion (A): For the rational transfer function H(z) to be causal, stable and causally invertible, both the zeroes and the poles should lie within the unit circle in the z-plane.Reason (R): For a rational system, ROC is bounded by poles

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