Which of the Following Statements Are TRUE Regarding the Building

Which of the following statements are TRUE regarding the building of a QoS-enabled network? (Choose two)

A) It is important that all packets are classified in the same way at all SAP-ingress points.
B) Once a packet is classified to a forwarding class, it cannot change across the network.
C) Packet enters a node will be treated as per the local hop's configured policy.
D) Native IP packets entering a network port will be marked at the first network egress by default
E) Native IP packets entering a network port will not be marked at the first network egress by default.
F) Native IP packets entering a network port will be marked at the first network egress, regardless of the re-marking configuration.