You need to ensure that the users in Site2 are authenticated by both DC2 and DC3

Your network contains an Active Directory domain named adatum.com. The domain
contains two sites named Site1 and Site2 and two domain controllers named DC1 and DC2.
DC1 is located in Site1 and DC2 is located in Site2.
You install an additional domain controller named DC3 in Site1 and you ship DC3 to Site2.
A technician connects DC3 to Site2.
You discover that users in Site2 are authenticated only by DC2.
You need to ensure that the users in Site2 are authenticated by both DC2 and DC3.
What should you do?

A.
In Active Directory Users and Computers, configure the msDS-PrimaryComputer attribute
for DC3.

B.
In Active Directory Users and Computers, configure the msDS-Site-Affinity attribute for
DC3.

C.
From Active Directory Sites and Services, move DC3.

D.
From Active Directory Sites and Services, modify the site link between Site1 and Site2.