A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?

A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?
A . Access point spectrum analyzer
B . Laptop-based spectrum analyzer with an omni-directional antenna
C . Laptop-based spectrum analyzer with a directional antenna
D . Laptop-based protocol analyzer with an omni-directional antenna

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Answer: B