The correct answer is D (SSL proxy) because it supports TCP traffic with the capability for SSL offload. According to Google Cloud's documentation, SSL Proxy Load Balancing terminates user SSL (TLS) connections at the load balancing layer and then balances the connections across your instances using either SSL or TCP protocols. It's specifically designed for non-HTTP(S) traffic. For HTTP(S) traffic, HTTP(S) load balancing is the recommended choice. SSL Proxy Load Balancing also supports both IPv4 and IPv6 addresses for client traffic, with IPv6 requests being terminated at the load balancing layer and then proxied over IPv4 to your backends. Options A and B are incorrect as they are only recommended for HTTP or HTTPS traffic. Option C is incorrect because the TCP proxy does not support SSL offload.