What should you do?

You work as the network administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. All servers on the Domain.com network run Windows Server 2008. Half the client computers run Windows XP Professional, and the rest run Windows Vista.
Your job function encompasses managing the Domain.com infrastructure. Due to company growth Tesckin.com acquired another company. You receive an instruction to merge the newly acquired company into your current domain and forest. Management wants you to create the domain of the new company as a new domain in order for it to be an addition the root domain of Domain.com.
What should you do?

A.
You should consider tolerating a canonical name record with the purpose of translating to the new domain.

B.
You should consider joining the new domain to a new forest.

C.
You should consider joining the new domain to the current one.

D.
You should consider creating a new FQDN as well as using a secondary zone.

Explanation:
Your best option in this scenario would be to create a new tree to form or add to a forest that is as simple as promoting a server to a domain controller for a new domain that does not share a namespace with an existing Active Directory domain. In order to have a new domain added to an existing forest, you should already encompass a minimum of one other domain. This domain then
serves as the root domain for the whole forest.