Which two statements regarding traffic$-$dropping design principles are correct? $($Choose two.$)$

DSCP$-$based WRED is applied on strict priority and control traffic queues.

DSCP$-$based WRED is applied on AF and default queues.

WRED is not needed for scavenger traffic because less bandwidth is allocated for the scavenger traffic queue; also, applying WRED for scavenger traffic will allocate more CPU resources.

DSCP$-$based WRED is not recommended on AF and default queues.