An architect plans 12 APs for an auditorium that is 325 square meters (3, 498 square feet). Each AP has one 2.4 GHz radio and one 5 GHz radio. Both types of radios use 20 MHz channels.
Assume that DFS channels can be used in this design. How many 5 GHz collision domains does this design provide?
A. 1
B. 6
C. 12
D. 25
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5Ghz Band has 12 channels (collision domains) as one center freq (20Mhz wide) non-over lapping channel per radio /per AP. 5Ghz has overall 23 non-overlapping channels in the spectrum.
The answer is C.
https://howwirelessworks.com/wp-content/uploads/Aruba_VHD_VRD_Theory_Guide.pdf
Also, 20 Mhz = 12 nonoverlapping channels; 40 Mhz is 6.