When a user uses the HUAWEI CLOUD ELB service to distribute load to multiple ECS instances, which of the following methods can be used to obtain the real IP address of the requesting user? (Multiple choice)

When a user uses the HUAWEI CLOUD ELB service to distribute load to multiple ECS instances, which of the following methods can be used to obtain the real IP address of the requesting user? (Multiple choice)
A . Layer 4 services can be obtained by installing the TOA plug-in on the back-end server to obtain the visitor’s real I
C . Layer 4 services can be obtained directly without additional configuration.
D . Layer 7 services can be obtained directly without additional configuration.
E . The 7th layer service can obtain the visitor’s real IP through Http Header: X-Forwarded For.

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Answer: AD