What does this configuration accomplish in a gRPC?

Refer to the exhibit.

An engineer applied a gRPC dial-in configuration on customer’s router to provide connection multiplexing and two-way streaming.

What does this configuration accomplish in a gRPC?
A . It is the encoding requested by the gRPC server.
B . IT is the encoding that is used for dial-in and dial-out.
C . It is used for encoding with the default protocol buffers
D . It is the encoding requested by the gRPC client.

Answer: A

Explanation:

https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2019/pdf/BRKNMS-3537.pdf

https://xrdocs.io/telemetry/tutorials/2018-03-01-everything-you-need-to-know-about-pipeline/

https://community.cisco.com/t5/service-providers-documents/implementing-grpc-telemetry-on-xr-devices/ta-p/3393966