Which two statements about the DiffServ QoS model are true? (Choose two)

Which two statements about the DiffServ QoS model are true? (Choose two)

A.
DiffServ requires RSVP to set up a path through the network to accomodate the requested QoS.

B.
Network traffic is identified by class, and the level of service os chosen for each class.

C.
The DiffServ model relies of a fairly simple mechanism to provide QoS over a wide range of equipment.

D.
RSVP enables the DiffServ model to provide end-to-end QoS.

E.
The DiffServ model is more scalable than the IntServ model.

F.
The flow-based approach of the DiffServ model is ideal for large scalable implemetations such as the public Internet.