Which of these radio form factors are used in 802.11 WIDS/WIPS sensors? (Choose all that apply.)

Which of these radio form factors are used in 802.11 WIDS/WIPS sensors? (Choose all that apply.)
A . Sensor with 2.4 GHz and 5 GHz radio
B . Sensor with 5 GHz radio and software-defined radio (SDR) for both 2.4 and 5 GHz
C . Sensor with three radios: 2.4 GHz, 5 GHz, and SDR radio
D . Sensor with 2.4 GHz radio, 5 GHz radio, and spectrum analyzer chip
E . Sensor with 900 MHz radio, 2.4 GHz radio, and 5 GHz radio
F . Depends on the vendor

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Answer: ABDE