In the 802.

The IEEE 802.11 channel plan for the 2.4 GHz ISM band defines channels numbered 1 through 14, with adjacent channel center frequencies separated by 5 MHz. Because a traditional 20 MHz Wi-Fi channel occupies substantially more spectrum than the 5 MHz center-frequency spacing, neighboring channels overlap. This is why WLAN planning normally uses a limited set of non-overlapping or minimally overlapping channels, such as 1, 6, and 11 in many regulatory domains. The fact that fourteen channel numbers exist in the standard does not mean that every country permits operation on every one of them. Regulatory domains restrict the usable subset; for example, channel 14 is not generally available worldwide and has historically been associated with specific Japanese operation. Huawei APs apply the configured regulatory domain to determine which channels may actually be selected. The statement concerns the standard channelization itself rather than regional permission to use every channel. On that basis, the statement is TRUE and option A is correct.