You're choosing between REST and gRPC for internal service-to-service calls. When is gRPC preferred?

1. A When you need native browser support across all legacy environments without utilizing polyfills or specialized proxy libraries.
2. B When you require high performance through binary protocols, strict contract enforcement via Protobuf, and bidirectional streaming support.
3. C When human readability of request and response payloads is a primary requirement for debugging with standard browser dev tools.
4. D When you want to avoid the overhead of defining a strict schema and prefer the flexibility of schema-less JSON message formats.