In which of the following scenarios is self-generated traffic QoS (sgt-QoS) useful?

In which of the following scenarios is self-generated traffic QoS (sgt-QoS) useful?
A . EXP markings on transit control traffic are not set correctly.
B . The priority of all self-generated traffic needs to be lowered to allow all other traffic to take precedence.
C . The priority of various control packets requires special treatment throughout the network.
D . The BGP process is consuming too many CPU cycles and is impacting OSPF performance.

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Answer: C