How would you characterize the source and type in a denial of service attack on a router?

A.
By perfornubg a show ip interface to see the type and source of the attack based upon the access-list matches

B.
By performing a show interface to see the transmitted load "txload" and receive load "rxload" ;if the interface utilization is not maxed out ,there is no attack underway

C.
By setting up an access-list to permit all ICMP ,TCP ,and UDP traffic with the log or log-input commands ,then use the show access-list and show log commands to determine the type and source of attack

D.
By applying an access-list to all incoming and outgoing interfaces,turning off route-cache on all interfaces,then,when telnetting into the router perform a debug IP packet detail