Which two of these are potential causes?

While reviewing data gathered during a passive RF site survey for an existing network of Cisco
Aironet 1260 Series Access Points, you discover a high amount of potential co-channel
interference throughout the network. Which two of these are potential causes? (Choose two.)

A.
an inconsistent beacon interval

B.
EDRRM is not enabled

C.
the APs are placed too close together

D.
a static channel plan is used

E.
the radio policy is inadvertently set identically for all SSIDs