Your network consists of an Active Directory domain and a DirectAccess infrastructure. You install Windows 7 on a new portable computer and join the computer to the domain. You need to ensure that the computer can establish DirectAccess connections. What should you do?

A.
Install a computer certificate.

B.
Create a new network connection.

C.
Enable the Network Discovery firewall exception.

D.
Add the computer account to the Network Configuration Operators group.