B is correct because an External TCP Network Load Balancer is designed to expose applications to the internet while preserving the client's IP address. It efficiently distributes incoming TCP traffic to instances within a managed instance group, keeping the source IP address intact. A is incorrect as an SSL Proxy Load Balancer is tailored for SSL/TLS termination at the proxy layer and does not maintain the client's IP address. C is incorrect because an Internal TCP Network Load Balancer is intended for internal TCP traffic within a VPC network and does not provide internet exposure. D is incorrect since a TCP Proxy Load Balancer operates at the application layer (Layer 7) for proxying TCP traffic and does not preserve the client's IP address. For more details, visit: Google Cloud Load Balancing.