As a network administrator, you have just received a feedback message that a customer at a branch office has been complaining about the slow access to static web content. After examination, you discover that there are many customers accessing the same site repeatedly the whole day. Which item below can improve WAN utilization?

A.
An application level firewall

B.
A traffic shaper

C.
A caching proxy server at the branch

D.
A load balancer at the datacenter hosting the web servers