Your network contains an Active Directory domain named contoso.com. The domain contains two domain controllers.
The domain controllers are configured as shown in the following table.

In the perimeter network, you install a new server named Server1 that runs Windows Server 2012 R2. Server1 is in a workgroup.
You need to perform an offline domain join of Server1 to the contoso.com domain.
What should you do first?（）

Your network contains an Active Directory forest named adatum.com. The forest contains a child domain named asia.adatum.com. The asia.adatum.com child domain contains a server named DHCP1 that runs Windows Server 2012 R2.
You install the DHCP Server server role on DHCP1.
You have access to the administrative accounts shown in the following table.

You need to authorize DHCP1.
Which user account should you use?（）