Which description of the Russian Doll Model is true?

Which description of the Russian Doll Model is true?
A. RDM matchers simple bandwidth control policies setting individual constraint for a given class type and simultaneously limit the aggregate of reservedbandwidth across all class types.
B. RDM guarantees a predefined amount of bandwidth for each class type and at the same time allows the bandwidth sharing by defining two pools for everyclass type: private pool (guaranteed bandwidth) and common pool (bandwidth shared between all class types)
C. RDM can be used simultaneously to ensure bandwidth efficiency and to protect against QoS degradation of all class types, whether preemption is used or not.
D. RDM provides bandwidth sharing while still providing bandwidth isolation and protection against QoS degradation, and also provides service differentiation for high-priority, normal-priority, and best-effort priority services.

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