The Maximum number of devices setting enables you to select the maximum number of devices that a user can have in Azure AD. If a user reaches this quota, they will not be able to add additional devices until one or more of the existing devices are removed. Incorrect Answers: A: The Users may join devices to Azure AD setting enables you to select the users who can join devices to Azure AD. Options are All, Selected and None. The default is All. C: Azure AD Join enables users to join their devices to Active Directory from anywhere as long as they have connectivity with the Internet. Reference: https://docs.microsoft.com/en-us/azure/active-directory/devices/device-management-azure-portal http://techgenix.com/pros-and-cons-azure-ad-join/