Which three of these are considered Cisco RF guidelines for a proper VoWLAN deployment?

Which three of these are considered Cisco RF guidelines for a proper VoWLAN deployment? (Choose
three.)

A.
Cell edge should be -67 dBm with 20 to 30 percent overlap.

B.
Channel utilization should be kept under 30 percent.

C.
Noise levels should not exceed -92 dBm.

D.
Packet loss should not exceed 5 percent.

E.
Jitter should be kept at a minimum (less than 300 ms).

F.
802.11 retransmissions should be less than 20 percent.