Your router is under distributed denial-of-service (DDoS) attack, which tool should you use to protect your Routing Engine (RE)?

A.
a policer applied to the input of fe-0/0/0.0

B.
a firewall filter applied to the input of fe-0/0/0.0

C.
a policy-statement to discard all routes to source addresses of DoS packets

D.
a firewall filter applied to the input of lo0.0