Refer to the exhibit. An MPLS-based service provider wants to deploy QoS over its backbone. Original customer QoS information must be preserved when the packet leaves the MPLS network. In…

Refer to the exhibit. An MPLS-based service provider wants to deploy QoS over its backbone. Original customer QoS information must be preserved when the packet leaves the MPLS network. In addition,the egress LSR must forward packets according to the LSP Diff-Service information, as depicted in the topology. Which QoS model satisfies these requirements?