What are differences between the DiffServ and IntServ models? (Multiple Choice)

What are differences between the DiffServ and IntServ models? (Multiple Choice)
A . The DiffServ model provides different services destined for different destinations.
B . The DiffServ model provides different services destined for different sources.
C . The DiffServ model does not need to maintain the status of each flow.
D . The DiffServ model applies to large-scale backbone networks.

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Answer: CD