Your network contains an Active Directory domain named contoso.local. All users have email
addresses in the @contoso.com domain. You need to ensure that users can register Windows
Phone 8.1 devices for mobile device management (MDM). Which DNS record should you create?

A.
Enterprisedevice.contoso.com

B.
Deviceregistration.contoso.local

C.
Deviceregistration.contoso.com

D.
Enterpriseregistration.contoso.com

E.
Enterpriseregistration.contoso.local

Explanation:
https://technet.microsoft.com/en-us/windows/dn771709.aspx