What should you do first?

You need to ensure that members of a group named Relecloudadmins can create user accounts and mailboxes for new employees by using Exchange Admin Center (EAC) after the planned upgrade.

What should you do first?
A . Run the New-ManagementRole cmdlet.
B . Run the New-ManagementRoleAssignment cmdlet.
C . Run setup.exe and specify the /PrepareDomain parameter.
D . Run setup.exe and specify the /prepareAD parameter.

Answer: B

Explanation:

References:

https://technet.microsoft.com/en-us/library/dd335193(v=exchg.160).aspx