In the Cisco Unified WLAN QoS, which two aspects create the need for collision avoidance
mechanisms? (Choose two.)

A.
Shared media: Multiple nodes share the frequency and only one can successfully

transmit at a time.

B.
Congested plant floors: Workers must maneuver without running into each other.

C.
Half-duplex communication: A radio cannot transmit and receive at the same time.

D.
Smart routing: Traffic is directed automatically according to priority.

E.
Limited budgets: Manufacturers will not spend the money to install enough
designated channels.