With which two does a scheduler map associate? （）

A.A scheduler contains parameters that describe how a queue should be serviced.
B.A scheduler contains traffic that is ready to be transmitted.
C.A scheduler contains forwarding classes that allow traffic to be forwarded.
D.A scheduler contains a map between the classification of a packet and its forwarding class.

A.Forwarding Class
B.Priority
C.TOS Marking
D.Buffer Size
E.RED Configuration

A.to provide policy based routing
B.to provide class of service capabilities
C.to provide firewall filtering capabilities
D.to provide unified threat managment