Which of the followings are the possible causes of the error?

After a customer uses Alibaba Cloud Anti-DDoS Premium Service, a 502 error is prompted.

Which of the followings are the possible causes of the error? (Number of correct answers 3)
A . Network congestion or jitter occurred
B . The IP address of the origin site is exposed and suffered an attack
C . The service was configured using the IP address method instead of the CI
D . The Anti-DDoS Service IP range was not released As a result, the origin site is blocked.

Answer: A,B,D

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