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? 

Answer options:

A. HTTP(S) load balancer 
B. Network load balancer 
C. Internal load balancer
D. TCP/SSL proxy load balancer

B

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