Which Windows PowerShell command should you run next?

You are the Office 365 administrator for your company. The company uses Microsoft Exchange Online and
Microsoft Lync Online.
An employee named User1 has the user name, email address, and Lync address [email protected].
The employee requests that you change only his Lync address to [email protected].
You start a Windows PowerShell session and run the following commands, providing your admin account
credentials when prompted:

You need to complete the process of updating the employee’s Lync address without affecting any otheraddresses.
Which Windows PowerShell command should you run next?

A.
Set-Mailbox -Identity $ID -PrimarySmtpAddress $NewAddress

B.
Set-MsolUser -UserPrincipalName $ID –ProxyAddresses @{add=”$NewAddress”; remove=”$OldAddress”}

C.
Set-CsUser -Identity $ID –ProxyAddresses @{add=”$NewAddress”; remove=”$OldAddress”}

D.
Set-CsUser –Identity $ID –SipAddress $NewAddress

Explanation:
You can easily change the SIP address by running the Set-CsUser cmdlet:
Set-CsUser –Identity “Ken Myer” –SipAddress sip:[email protected]