Which two statements about exception traffic processing are correct? (Choose two.)

Which two statements about exception traffic processing are correct? (Choose two.)

A. When congestion occurs, only exception traffic is given preference. B. By default, a rate-limiter for exception traffic exists on the internal link between the control plane and the forwarding plane C. When congestion occurs, local and control traffic are given preference. D. By default, no rate-limiter for exception traffic exists on the internal link between the control plane and the forwarding plane.