Which type of load balancer should you use?

You are deploying a global external TCP load balancing solution and want to preserve the source IP address of the original layer 3 payload.

Which type of load balancer should you use?
A . HTTP(S) load balancer
B. Network load balancer
C. Internal load balancer
D. TCP/SSL proxy load balancer

Answer: D

Explanation:

By default TCP/SSL proxy load balancer original client IP address and port information is not preserved, but it can be preserved using the PROXY protocol: https://cloud.google.com/load-balancing/docs/tcp#target-proxies https://medium.com/google-cloud/preserving-client-ips-through-google-clouds-global-tcp-and-ssl-proxy-load-balancers-3697d76feeb1

Reference: https://cloud.google.com/load-balancing/docs/network