Assertion (A): A necessary and sufficient condition for a feedback system to be stable is that all the poles of the system transfer function have negative real parts.Reason (R): To obtain a bounded response, the poles of the closed-loop system must be in the left half portion of the s-plan.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) false, but (R) is true