Which two Cisco antennas provide better isolation from RF sources that might be located behindthe antennas？（）

A.Bluetooth
B.frequency hopping
C.microwave oven
D.802.11b client card
E.802.11b access point

A.ISM 2.4 GHz
B.ISM 900 MHz
C.ISM 5 GHz
D.public safety 4.9 GHz
E.GSM 1.9 GHz

A.data/coverage
B.location with Monitor Mode access points
C.demand
D.high density