You need to connect 100 distributed sensors to your Azure IoT infrastructure, authenticated with SAS tokens. The devices are Azure certified sensors developed by a major sensor manufacturer. To speed up the provisioning process, you decide to use IoT Central, by executing the following steps: Add device ID, SAS, ID scope, and Model ID to device code
Import list of devices from CSV
Export device data to CSV
Connect devices
What is the correct order of the steps above?

Answer options:

A.2, 3, 1, 4
B.1, 2, 3, 4
C.2, 1, 3, 4
D.2, 4, 3, 1

Correct Answer: A
Option A is CORRECT because, during bulk provisioning of devices, the list of 100 device ID-s and names can be imported from CSV. IoT Central automatically creates the devices with the necessary SAS keys. The device list, together with the credentials can be exported to CSV, which then can be used to update the code on the devices. ID Scope and Model ID also need to be added before actually connecting the device.
Option B is incorrect because importing the list of devices must precede the further steps. This is the first step which is the basis of mass-creation of devices in the IoT Central.
Option C is incorrect because immediately after creating the devices in the IoT Central (from the list exported earlier), the same list of devices, complemented with authentication data (SAS keys) must be exported and then used for updating the device codes.
Option D is incorrect because all the other steps must be executed before the devices can connect.
References: 

https://docs.microsoft.com/en-us/azure/iot-central/core/concepts-get-connected#bulk-register-devices-in-advance
https://docs.microsoft.com/en-us/azure/iot-central/core/howto-manage-devices#import-devices