According to the following statement， can you tell me which term is described？（）
It is the air return for an air conditioned system. In most buildings， the area above a drop ceiling orunder a raised floor is used as the air return （source of air） for the air conditioning. Those drop
ceiling and raised floors are also where wire is often installed. If wire and cable is installed in a dropceiling or raised floor， it is out of sight. If that cable were burning， it would give off toxic fumes.These would be fed to the rest of the building by the air conditioner. As a result， people could beinjured even though they are a long way from the fire.
A.DAS area
B.plenum area
C.extended area
D.RF special area
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A.show {802.11a 802.11b} 2roam statistics
B.show client roam-history
C.show client tsm 802.11a/b/g
D.show client detail
E.show client ap-roam-history
A.average signal strength that is greater than -67 dBi
B.cell overlap of 15 to 20 percent
C.uneven wireless coverage
D.absence of coverage holes
A.more access points than a data network
B.fewer access points than a data network
C.less SNR than a data network
D.specific relative access point placement
A.omnidirectional
B.patch
C.Yagi
D.sector
E.parabolic dish
A.Alternate polarization between colocated antennas
B.Cross-polarize antennas between endpoints
C.Install an RF-shielded box around the antennas
D.Increase the distance between the antennas
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