Which two characteristics describe the difference between MPLS QoS pipe and short-pipe models?

A.	Short-pipe mode does not need MPLS usage, but pipe mode does.
B.	In short-pipe mode, the egress LSR uses the tunneled PHB marking, but in pipe mode, the egress LSR uses the LSP PHB marking.
C.	Pipe mode does guarantee that the tunneled packet marking remains unchanged, but short- pipe does not.
D.	In short-pipe mode, the egress LSR uses the LSP PHB marking, but in pipe mode, the egress LSR uses the tunneled PHB marking.
E.	Short-pipe mode can be implemented on MPLS networks regardless of the MPLS PHP mechanism usage.