I think the answer should be: D
Pag 337 CCNP and CCIE Data Center Core DCCOR 350-601 Official Cert Guide
"Cisco NX-OS streaming telemetry allows you to push data off the device to a defined
endpoint as JavaScript Object Notation (JSON) or using Google Protocol Buffers (GPB) at
a much higher frequency and more efficiently, as shown in Figure 6-13."
ENCODING:
JSON encoding: Data is streamed in strings of keys and its values in a human-readable format.
TRANSPORT:
Google Protocol RPC (gRPC): used for both dial-in and dial-out modes.
Not C. "Data Transport — NX-OS transports telemetry data using HTTP for JSON encoding and the Google remote procedure call (gRPC) protocol for GPB encoding."
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/progammability/guide/b-cisco-nexus-9000-series-nx-os-programmability-guide-93x/b-cisco-nexus-9000-series-nx-os-programmability-guide-93x_chapter_0101001.html
Streaming telemetry is a push model in which network devices generate and push telemetry data to a collector in real-time, without waiting for monitoring clients to request it. This enables monitoring clients to receive real-time updates on the state of the network and respond to issues quickly.
Correct Answer D , section Encoder in below link
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/telemetry/70x/b-telemetry-cg-ncs5500-70x/b-telemetry-cg-ncs5500-70x_chapter_01.html
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