D its correct. According the book (...) d X-ray areas, where the walls might be lead-lined and completely stop RF signals.(...) Its not A because says:(...) These devices may also use the same spectrum as Wi-Fi but with other protocols and, therefore, become sources of interference for your system(...) It does not mention non-Wifi interference, it says the same Wifi spectrum.
It's because inside those rooms you're standing basically in a microwave own, which again has the potential to cause cancer, so the room must contain radio waves which means attenuation.
Just picture putting your level 1 scanner inside a microwave own and consider what signal you get in there. Hopefully none if its not defect otherwise one should replace it.
A
From the Book - portable X-ray machines, sending high-resolution images, sometimes in real time, echography machines, and electrocardiography [ECG] machines). These devices may also use the same spectrum as Wi-Fi but with other protocols and, therefore, become sources of interference for your system.
I have read this as well, but answer A states: " X-rays create significant non-Wi-Fi interference on the 802.11a band."
The X-Rays it selves are not in the 5 GHz spectrum.
22 years in IT in a hospital here, portable x-ray machines aren't used in 'x-ray rooms'. They're taken to the patient because for one reason or another, the patient can't come to the lead lined room mentioned in the question. So portable X-ray machines is a moot point. The answer is D, and it's why we have wifi points inside our x-ray rooms.
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