what should be checked first if your customer is reporting poor performance across all optimized applications?

During a Cisco WAAS deployment, what should be checked first if your customer is
reporting poor performance across all optimized applications?

A.
Verify that PBR has a route map for each direction of traffic flow

B.
Verify that WCCP is configured with one service group in the path of each direction of
traffic flow

C.
Verify that duplex settings are configured correctly on all interfaces

D.
Verify that only one Central Manager WAE is set to active