When should traffic shaping be implemented on Frame Relay PVCs? (Choose two)

A.
When you want to drop excess traffic above the CIR

B.
When there is a speed mismatch between the central site and the remote site.

C.
When using Frame Relay SVCs

D.
When over-subscribing the central site link

E.
When LLQ is implemented on the Frame Relay PVC.

F.
When Multilink PPP LFI is implemented on the Frame Relay PVC.