A customer is discussing QoS requirements with a network consultant. The customer has specified that end-to-end path verification is a requirement. Which QoS architecture is most appropriate for the requested design?

A.	DiffServ model with PHB to support the traffic flows
B.	Marking traffic at the access layer with DSCP to support the traffic flows
C.	IntServ model with RSVP to support the traffic flows
D.	Marking traffic at the access layer with CoS to support the traffic flows