You as an IoT Engineer, need to provision thousands of new devices over several IoT Hubs. Because of the large number of devices, you need to use the DPS service. You know that the following steps must be completed in order to get the solution fully operating: Create an enrollment list containing the registration information of the devices
Connect the devices to the DPS
DPS <..........1........> of the devices in the enrollment list
DPS registers the devices with an IoT Hub
DPS <..........2........> of the devices
The IoT hub returns the device ID to the DPS
DPS returns the connection information to the device
The device connects to the IoT Hub
The device <..........3........> from its device twin
The device starts sending data
Which of the following actions fit into the above steps?

Answer options:

A.1- sets the desired state; 2- validates the identity; 3 - gets the desired state
B.1 - sets the desired state; 2 - validates the identity; 3 - gets the tag values
C.1 - validates the identity; 2 - sets the desired state; 3 - gets the desired state
D.1 - validates the identity; 2 - gets the reported state; 3 - gets the desired state

Correct Answer: C
Option A is incorrect because the identity of the device is validated before the desired state is set.
Option B is incorrect because the identity of the device is validated before the desired state is set. Furthermore, the tag values are not accessible for devices.
Option C is CORRECT because after the first connection of the device, DPS validates its identity the, after successful registration, it sets the desired state in the device twin, which then will be retrieved by the device before it starts sending telemetry.
Option D is incorrect because at this stage, there is no reported state of the device. Reported state is only populated after the device has connected to the IoT hub.
Reference: 

https://docs.microsoft.com/en-us/azure/iot-dps/about-iot-dps#behind-the-scenes