Which three of these items can a wireless assisted site survey optimize? (Choose three.)

A.
channel selection

B.
radio transmit power setting

C.
beacon interval

D.
IDS settings

E.
security selection

F.
IPS auto-response settings

Explanation:
http://www.dd-wrt.com/wiki/index.php/Advanced_wireless_settings
Beacon interval is the time interval between two consecutive beacon frames. A beacon is a packet broadcast by the router to synchronize the wireless network. 50 bytes is recommended in poor reception. How a beacon interval impacts the client By default, radio NICs passively scan all RF channels and listen for beacons coming from access points in order to find a suitable access point. When a beacon is found, the radio NIC learns a great deal about that particular network. This enables a ranking of access points based on the received signal strength of the beacon, along with capability information regarding the network.
The radio NIC can then associate with the most preferable access point.