You are building an industrial IoT solution where you collect telemetry data from a number of temperature sensors installed on high-performance pumps. Based on the telemetry data sent, the messages must be forwarded to a storage container, but in the cases where the temperature values coming from building 51 (which is a priority site) exceed 60 degrees must be published to a Service Bus topic which is monitored by the operations and maintenance personnel. You need to define message routing. 
How should you compose the routing query for the temperature exceptions?

Answer options:

A.$Coolant.Temperature > 60AND $deploymentLocation.building = "51"
B.Application.properties.Coolant.Temperature > 60AND $System.properties.deploymentLocation.building = "51"
C.$body.Coolant.Temperature > 60AND $twin.tags.deploymentLocation.building = "51"
D.$body.Coolant.Temperature > 60AND $twin.properties.reported.deploymentLocation.building = "51"

Correct Answer: C
Option A is incorrect because device-to-cloud messages have to comply with the common format of system properties, application properties and a message body. Properties starting with “$” are taken as system properties. The property names in this option are invalid.
Option B is incorrect because system properties in D2C messages have a fixed set of properties which cannot be extended or altered. Application properties are user-defined strings but they are not intended to be used for storing telemetry data. In addition, the format of the parameters is wrong.
Option C is CORRECT because the telemetry data are coming in the body section of the device-to-cloud messages, while static deployment locations of the devices is typically defined as a device twin tag.
Option D is incorrect because the physical location of the devices is typically defined as device twin tag. Properties.reported are used by devices to report actual values against desired properties.
References: 

https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-routing-query-syntax
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-construct
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-construct