How should this problem be solved?

When enrolling a device into a newly set up Workspace ONE environment, a user receives the error message “Invalid User Credentials”. The user has verified that they are using the correct Active Directory credentials. The user has also successfully performed the “Test Connection” process to the Active Directory integration within the Workspace ONE UEM, but they still get the same error.

How should this problem be solved?
A . Check the Device Enrollment restriction settings.
B . Exit the Airplane mode on a mobile device.
C . Enable Directory Authentication as the authentication mode.
D . Enable the Workspace ONE REST AP

Answer: A