You have an Active Directory directory service environment with a single forest and multiple domains. You create a new domain named sales.west.corp.contoso.com. E-mail addresses are username@sales.west.corp.contoso.com. Users log on to the domain using their e-mail address. Logging on is tedious for users in the new domain due to the lengthy logon names. You need to shorten users logon names. What should you do first?

A.
Create a new UPN suffix named Sales.

B.
Create a shortcut trust between the new domain and the forest root domain.

C.
Enable routing of the Sales NetBIOS name.

D.
Create a new DNS alias (CNAME) record named Sales and point it at sales.west.corp.contoso.com.