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 spectrum analyzer with an omni-directional antenna.