Your network contains an Active Directory domain named contoso.com. Contoso.com
contains two domain controllers. The domain controllers are configured as shown in the
following table.

All client computers have IP addresses in the 10.1.2.1 to 10.1.2.240 range.
You need to minimize the number of client authentication requests sent to DC2.
What should you do?

A.
Create a new site named Site1. Create a new subnet object that has the 10.1.1.0/24
prefix and assign the subnet to Site1. Move DC1 to Site1.

B.
Create a new site named Site1. Create a new subnet object that has the 10.1.1.1/32
prefix and assign the subnet to Site1. Move DC1 to Site1.

C.
Create a new site named Site1. Create a new subnet object that has the 10.1.1.2/32
prefix and assign the subnet to Site1. Move DC2 to Site1.

D.
Create a new site named Site1. Create a new subnet object that has the 10.1.2.0/24
prefix and assign the subnet to Site1. Move DC2 to Site1.

Explanation:
Creating a new site and assigning a subnet of 10.1.1.2 with subnet mask of
255.255.255.255, it means only ONE ip (the DC2 ip) will be included on the site1 subnet
coverage. Therefore all the request will be processed from the DC1 in the default-first-site
and dc2 will authenticate only itself.