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Question is asking how many non-overlapping 5GHz channels there are if UNII-2c isn't available. Correct answer should be six non-overlapping channels, not four. Refer to the following chart: https://www.mbreviews.com/wp-content/upl...scaled.jpg

For 40MHz channels, there are two in UNII-1, a further two in UNII-2a and another two in UNII-3.

Yes, you're right, although there are 6 non-overlapping channels available, 2 are reserved for DFS (Dynamic Frequency Selection). Hence, only four remain, thus the answer.