What should you include in the recommendation?

Your company has a main office and 20 branch offices. All of the offices connect to each
other by using a WAN link.
The network contains an Active Directory forest named contoso.com. The forest contains a
domain for each office. The forest root domain contains all of the server resources.
Each branch office contains two domain controllers for the branch office domain and one
domain controller for the contoso.com domain.
Each branch office has a support technician who is responsible for managing the accounts
of their respective office only.
You recently updated all of the WAN links to high-speed WAN links.
You need to recommend changes to the Active Directory infrastructure to meet the following
requirements:
Reduce the administrative overhead of moving user accounts between the offices.
Ensure that the support technician in each office can manage the user accounts of their
respective office.
What should you include in the recommendation?
More than one answer choice may achieve the goal. Select the BEST answer.

A.
Create a new child domain named corp.contoso.com. Create a shortcut trust between
each child domain and corp.contoso.com.

B.
Create shortcut trusts between each child domain. In the main office, add a domain
controller to each branch office domain.

C.
Move all of the user accounts of all the branch offices to the forest root domain.
Decommission all of the child domains.

D.
Create a new forest root domain named contoso.local. Move all of the user accounts of all
the branch offices to the new forest root domain. Decommission all of the child domains.