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.

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Answer: B,C