What should you do first?

You have a Microsoft Exchange Online tenant that contains 1,000 user mailboxes and 10 mail-enabled users. The mail-enabled users have email addresses in two SMTP domains named fabrikam.com and contoso.com.

You need to convert the mail-enabled users into user mailboxes.

What should you do first?
A . Remove the remote domains of fabrikam.com and contoso.com.
B . Assign a license to each user.
C . Add the users to an Office 365 group.
D . Modify the email forwarding settings of each user.

Answer: A

Explanation:

You need to remove the remote domains first then assign a license to the user account.