Question: After a security incident, a network security engineer discovers that a portion of the company's sensitive external traffic has been redirected through a secondary ISP

After a security incident, a network security engineer discovers that a portion of the company's sensitive external traffic has been redirected through a secondary
ISP that is not normally used.
Which of the following would BEST secure the routes while allowing the network to function in the event of a single provider failure?
A. Disable BGP and implement a single static route for each internal network.
B. Implement a BGP route reflector.
C. Implement an inbound BGP prefix list.
D. Disable BGP and implement OSPF.

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