Which of the following scenarios should be handled by anti-DDOS service? (the number of correct answers: 3)

Which of the following scenarios should be handled by anti-DDOS service? (the number of correct answers: 3)
A . Server is under syn flood attack, and is not reachable
B . online game service which is suffering with too many empty connections and slow
connections
C . DNS server is under udp flood attack and got no response anymore
D . website is under SQL injection attack
E . website is under XSS attacks

Answer: A,B,C