Which two messages and payload encodings does gNMI use?

An engineer must change from using NETCONF for streaming telemetry to telemetry data using gRPC framework because NETCONF uses XML for message and payload encoding. Which two messages and payload encodings does gNMI use? (Choose two.)
A. gNMI notifications with XML
B. protobuf notifications with XML
C. protobuf payload
D. JSON payload
E. gNMI notifications with JSON