You want to use IoT Central to monitor your connected devices. The devices operate on the shop-floor area of a manufacturing plant where an alert has to be triggered automatically when the average of the temperature in the past 10 minutes exceeds 50 degrees. Upon this condition, a sound alarm needs to be activated. You need to define IoT Central rules to monitor the above condition. 
Which is not the way of defining the rule?

Answer options:

A.Define a device template property, set it to 50 and use it in the Value of the rule
B.Define a cloud property, set it to 50 and use it in the Value of the rule
C.Define a device property, set it to 50 and use it in the Value of the rule
D.Set the Value of the rule to 50

Correct Answer: C
Option A is incorrect because a “Property” capability defined in the device template can be used on the right side of the rule condition.
Option B is incorrect because you can use a pre-set cloud property from the device template in the Value field of the rule condition.
Option C is CORRECT because the devices don’t have properties that could be used in rule definitions. Each device must be assigned to a device template and it is the template that stores data (in the format of Properties or Cloud properties) that can be used in rules to be compared with actual telemetry data.
Option D is incorrect because you can directly enter a value matching with the type of telemetry data in the Value field of the rule condition.
Reference: 

https://docs.microsoft.com/en-us/azure/iot-central/core/howto-configure-rules