Explanation:
The correct answer is A. An Application Load Balancer (ALB) operates at the application layer (Layer 7) of the OSI model and supports HTTP/HTTPS traffic. It adds the X-Forwarded-For header to the request as it forwards it to the target, which contains the original client's IP address. This allows the application behind the ALB to access the client IP addresses.
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Which AWS load balancer configuration supports HTTP/HTTPS and enables access to client IP addresses?
A
Application Load Balancer with X-Forwarded-For headers.
B
Network Load Balancer with proxy protocol enabled.
C
Application Load Balancer using instance ID for target registration.
D
Network Load Balancer with X-Forwarded-For headers.