The Chief Executive Officer (CEO) of an Internet service provider (ISP) has decided to limit the company’s
contribution to worldwide Distributed Denial of Service (DDoS) attacks. Which
of the following should the ISP implement? (Select TWO).

A.
Block traffic from the ISP’s networks destined for blacklisted IPs.

B.
Prevent the ISP’s customers from querying DNS servers other than those hosted by the ISP.

C.
Scan the ISP’s customer networks using an up-to-date vulnerability scanner.

D.
Notify customers when services they run are involved in an attack.

E.
Block traffic with an IP source not allocated to customers from exiting the ISP’s network.