How is the congestion alleviated? so that legitimate business traffic reaches the destination?

An organization has seen a lot of traffic congestion on their links going out to the interanet. There is a Cisco Firepower device that processes all of the traffic going to the internet prior to leaving the enterprise.

How is the congestion alleviated? so that legitimate business traffic reaches the destination?
A . Create a VPN policy so that direct tunnels are established to the business applications
B . Create a Qos policy rate-limiting high bandwidth application
C . Create a NAT policy so that the Cisco Firepower device does not have to translate as many addresses
D . Create a flexconfig policy to use WCCP for application aware bandwidth limiting

Answer: B