You need to configure BranchCache for the branch office

HOTSPOT
Your company has a main office and a branch office. The main office is located in Detroit.
The branch office is located in Seattle.
The network contains an Active Directory domain named adatum.com. Client computers run
either Windows 7 Enterprise or Windows 8 Enterprise.

The main office contains 1,000 client computers and 50 servers. The branch office contains
20 client computers.
All computer accounts for the branch office are located in an organizational unit (OU) named
SeattleComputers. A Group Policy object (GPO) named GPO1 is linked to the
SeattleComputers OU.
You need to configure BranchCache for the branch office.

Answer:

Explanation:
http://technet.microsoft.com/en-us/library/dd637820(v=ws.10).aspx

Distributed Cache mode
If client computers are configured to use Distributed Cache mode, the cached content is
distributed among client computers on the branch office network. No infrastructure or
services are required in the branch office beyond client computers running Windows 7.
Hosted Cache mode
In hosted cache mode, cached content is maintained on a computer running Windows
Server 2008 R2 on the branch office network.