Your companys Active Directory structure contains a root domain in site A and a single child domain in site B. You are preparing to install Exchange Server 2007 in the child domain. In the root domain, you run the Setup /PrepareAD command. You need to ensure that you can install Exchange in the child domain. What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.
In the child domain, run the Setup /DomainPrep command

B.
In the child domain, run the Setup /PrepareDomain command

C.
In the root domain, run the Setup /ForestPrep command

D.
In the root domain, run the Setup /PrepareDomain command

E.
In the root domain, run the Setup /PrepareAllDomains command