HOTSPOT
You are the Office 365 administrator for Contoso, Ltd.
An employee with the user name User1 has requested a secondary email address of Alias1@contoso.com.
You need to assign the secondary email address.
How should you complete the relevant Windows PowerShell script? To answer, select the appropriate option
from each list in the answer area.
Hot Area:

Answer:

Explanation:
We use the Set-Mailbox cmdlet to assign email addresses to a mailbox.
Set-Mailbox -Identity user1@contoso.com –EmailAddresses <list of email addresses>.
The first email address listed is the primary email address (in this case User1@contoso.com). Any further emailaddresses listed are secondary email addresses (in this case Alias1@contoso.com).
http://o365info.com/manage-email-address-using-powershell/