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 so...

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 solution meets this requirement?

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