A Classic load balancer has been setup in AWS where the backend instances listen on the TCP protocol. There is a requirement to get the client IP’s which hit the load balancer. Which of the following can be used to fulfil this requirement

Answer options:

A.Use the Proxy Protocol Header
B.Configure sticky sessions
C.Configure connection draining
D.Configure Cross-Zone Load balancing

Answer - A
The AWS documentation mentions the following
The Proxy Protocol header helps you identify the IP address of a client when you have a load balancer that uses TCP for back-end connections. Because load balancers intercept traffic between clients and your instances, the access logs from your instance contain the IP address of the load balancer instead of the originating client. You can parse the first line of the request to retrieve your client`s IP address and the port number.
For more information on Proxy protocol please visit the below URL:
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/enable-proxy-protocol.html