You are operating a fleet of IoT devices which consists of several different types of environmental sensors. Because of some changes in the EHS standards, the maximum temperature limits for the sensors must be updated using the automatic device configuration feature of IoT hub. As the first step of the update process, you need to define the device scope of the operation. 
<pre class="brush:java;">1. tags.deviceType=`tempSensors`
2. properties.reported.sensorProperties.model=`MX-100C`
3. properties.desired.sensorProperties.HighAverageTemp=`35`
4. tags.location.city=’Bowmore’ 
</pre>
Which of the above expressions are valid target conditions that can be used to define the scope?

Answer options:

A.Only 1 and 3
B.1, 2 and 4
C.Only 3 and 4
D.All four are valid target conditions

Correct Answer: B
Option A is incorrect because the “properties.desired” path in the device twin is used to define the target content (i.e. the values to be set), not for defining a set of devices.
Option B is CORRECT because the target condition is specified as a query on twin tags and/or reported properties. The target condition defines the scope of device twins or module twins to be updated.
Option C is incorrect because the “properties.desired” path in the device twin is used to define the target content (i.e. the values to be set), not for defining a set of devices.
Option D is incorrect because the “properties.desired” path in the device twin is used to define the target content. Target conditions can be specified using “tags” and/or “properties/reported” paths of the device twin.
Reference: 

https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-automatic-device-management#target-devices