You need to ensure that when the Montreal Site domain controller is offline, authentication requests for Montreal…

A corporate network includes a single Active Directory Domain Services (AD D5) domain.
The AD DS infrastructure is shown in the following graphic.

When the Montreal Site domain controller is offline, authentication requests for Montreal
branch office users are sent to the Toronto Site domain controller.
You need to ensure that when the Montreal Site domain controller is offline, authentication
requests for Montreal branch office users are sent to the Quebec City Site domain controller.
What should you do?

A.
Create a site link bridge between the Montreal Site and the Quebec City Site.

B.
Create a registry entry on each client computer in the Montreal branch office,

C.
Enable the global catalog role on the Montreal Site domain controller

D.
Delete the Toronto-Montreal Site Link.