Your company has a single Active Directory Domain Services (AD DS) forest with two domains. The HR domain is used exclusively by the human resources (HR) department. The other domain is used by all other departments. The company uses System Center Configuration Manager 2007 R2 for operating system deployments.
You create a task sequence to deploy Windows 7 and Office 2010 to client computers.

You need to ensure that the computer accounts for the employees in the HR department are joined to the HR domain.

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A.
Create a collection for the HR department.

B.
Create computer associations for the HR department client computers.

C.
Create computer associations for the Windows 7 client computers.

D.
Create a per-collection custom variable.