Answer: Look into the X-Forwarded-For header in the backend

Overall explanation Correct option: Look into the X-Forwarded-For header in the backend The X-Forwarded-For request header helps you identify the IP address of a client when you use an HTTP or HTTPS load balancer. Because load balancers intercept traffic between clients and servers, your server access logs contain only the IP address of the load balancer. To see the IP address of the client, use the X-Forwarded-For request header. Elastic Load Balancing stores the IP address of the client in the X-Forwarded-For request header and passes the header to your server. Incorrect options: Modify the front-end of the website so that the users send their IP in the requests - When a user makes a request the IP address is sent with the request to the server and the load balancer intercepts it. There is no need to modify the application. Look into the X-Forwarded-Proto header in the backend - The X-Forwarded-Proto request header helps you identify the protocol (HTTP or HTTPS) that a client used to connect to your load balancer. Look into the client's cookie - For this, we would need to modify the client-side logic and server-side logic, which would not be efficient.

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