You are building an IIoT solution of a chemical plant. As part of this, you need to connect with many pressure monitoring devices to an IoT Hub and configure the device twins for them appropriately. Here is the list of the attributes to be added to the twin: Deployment location -> [?]
Maximum acceptable pressure -> [?]
Battery charge level -> [?]
Firmware version -> [?]
Telemetry send frequency -> [?]
Which device twin sections should you select for the data above?

Answer options:

A.tags; tags; properties.reported; tags; properties.desired
B.tags; properties.desired; properties.reported; tags; properties.desired
C.device.identity; properties.reported; tags; properties.reported
D.Tags; properties.required; properties.reported; tags; properties.required

Correct Answer: B
Option A is incorrect because maximum acceptable pressure is a prescribed value which has to go into the “desired” properties.
Option B is CORRECT because deployment location and firmware version are meta-data of the device and should go to the “tags” section; acceptable pressure and telemetry send frequency are prescribed values and should go to the “desired” properties; battery charge level is a value updated by the device among the “reported” properties.
Option C is incorrect because deployment location is a meta-data of the device which should be added to the “tags” section. The device identity section (i.e. the root of the device twin document) is reserved for device-level identification and status data. Telemetry send frequency is the desired property.
Option D is incorrect because the correct name of the section for the prescribed values is “desired” (not “required”).
Reference: 

https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-device-twins