Refer to the exhibit. An engineer is preparing to implement data plane security configuration.Which statement about this configuration is true?

Refer to the exhibit. An engineer is preparing to implement data plane security configuration.Which statement about this configuration is true?

A. Router 2 is the router receiving the DDoS attack. B. Router 1 must be configured with uRPF for the RTBH implementation to be effective. C. Router 1 is the trigger router in a RTBH implementation. D. Router 2 must configure a route to null 0 for network 192.168.1.0/24 for the RTBH implementation to be complete.