Which two techniques can be used in service provider-style networks to offer a more dynamic, flexible, controlled, and secure control plane design?

The Layer 3 control plane is the intelligence over the network that steers traffic toward its intended destination.

Which two techniques can be used in service provider-style networks to offer a more dynamic, flexible, controlled, and secure control plane design? (Choose two.)
A . access control lists
B . firewalls
C . QoS policy propagation with BGP
D . remote black-holing trigger
E . prefix lists

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Answer: C,D