Your company uses Office 365 for all users.
The company has the contoso.com SIP domain.
You need to change the SIP address of a user named User1 from userl@contoso.com to user2@contoso.com.
You must achieve this goal in the minimum amount of time.
What should you do?

A.
Modify the PrimarySmtpAddress attribute of User1.

B.
Add a proxy address to the properties of User1.

C.
Create a service request.

D.
Modify the sign-in status of User1.