What potential drawback is present with this DFS test method?

You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminary WLAN design specifies support for the 5 GHz spectrum, you would like to test for radar pulses to determine if DFS channels should be supported at this facility. As a part of your spectral survey with a laptop-based analyzer, you include DFS testing to identify the presence of radar. This is done by manually observing Real-time FFT, Duty Cycle, and Active Devices charts of the spectrum analyzer software.

What potential drawback is present with this DFS test method?
A . Many WLAN products that support DFS channels report several false positives. Ideally, the actual WLAN equipment used in the deployment should be used to test for DFS.
B . Some sources of 5 GHz radar, such as military ships, are mobile in nature. A longer, automated test setup should be used to identify the presence or absence of radar.
C . Manual identification of radar pulses using spectrum analysis charts can be very difficult due to radar’s low amplitude at the Wi-Fi receiver.
D . Modern spectrum analyzer adapters do not provide the necessary bandwidth resolution required to detect and measure radar signatures.

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Answer: C