Your company has an Active Directory directory service forest with a forest root domain and a child domain. You have two Active Directory sites named Site1 and Site2. The two sites represent physical locations that are connected by a WAN link. All domain controllers are located in Site2. All users log on to the child domain. Several users in Site1 use computers that run Windows NT 4.0 operating systems. You configure a new domain controller for each domain, and you place the new domain controllers in Site1. You need to ensure that all users in Site1 can change their passwords in the event of a WAN link failure. What should you do?

A.
Transfer the root domain PDC Emulator role to a domain controller in Site1.

B.
Transfer the child domain PDC Emulator role to a domain controller in Site1.

C.
Transfer the root domain Infrastructure Master role to a domain controller in Site1.

D.
Transfer the child domain Infrastructure Master role to a domain controller in Site1.