You are operating an industrial IoT solution where devices are deployed on the shop-floor area of a manufacturing plant. In addition to a number of simple temperature and humidity sensors, there are edge devices in your network with processing modules for each type of sensor. In IoT Central you try to configure a rule to trigger alerts when the average temperature in the past 10 minutes exceeds 50 degrees and the humidity is less than 60%. 
Which of the following statements is true for the given scenario?

Answer options:

A.It is not allowed to set rules on telemetry from different modules.
B.You cannot have simple sensors and edge devices with the same type of sensors in the same network.
C.You cannot set rules which combine conditions on data coming from different modules of the edge device.
D.You cannot use rules which combine conditions on several sensors.

Correct Answer: C
Option A is correct because you can build rules from any valid telemetry data type. The conditions are combined with logical AND operations. The only exceptions are edge devices where telemetry from different modules cannot be combined.
Option B is incorrect because, actually you can. You can have any mix of sensors and devices in your IoT network.
Option C is CORRECT because for edge devices, there is a limitation on setting rules: rules combining conditions on telemetry data originating from different modules on an edge device will result in an error and cannot be used.
Option D is incorrect because there is no such limitation in IoT Central. When you add multiple conditions to a rule, they are evaluated True when all the conditions are True (there is an AND relationship between them).
Reference: 

https://docs.microsoft.com/en-us/azure/iot-central/core/howto-configure-rules#use-rules-with-iot-edge-modules