In which of the following scenarios is the egress port scheduler useful? (Choose two)

In which of the following scenarios is the egress port scheduler useful? (Choose two)
A . A customer is complaining that his VoIP traffic is being dropped even though it is sending the correct DSCP markings. Packets are not being dropped on ingress.
B . A customer is complaining that his VoIP traffic is being dropped even though it is sending the correct DSCP markings. Packets are being dropped on ingress.
C . A commercial builder has requested numerous dot1Q epipes, VPRNs, and VPLS services to a business park and is only paying up to a maximum 200Mbps.
D . An equipment manufacturer has requested a NULL epipe service that will transparently pass dot1Q between the new location and national headquarters.

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Answer: A,C