You are designing a new application that has backends internally exposed on port 800. The application will be exposed externally using both IPv4 and IPv6 via TCP on port 700. You want to ensure high availability for this application. What should you do?

A. Create a network load balancer that used backend services containing one instance group with two instances. B. Create a network load balancer that uses a target pool backend with two instances. C. Create a TCP proxy that uses a zonal network endpoint group containing one instance. D. Create a TCP proxy that uses backend services containing an instance group with two instances.