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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
At the beginning I thought that was D, but after reading this... "The SSID is a unique identifier that wireless networking devices use to establish and maintain wireless connectivity. Multiple access points on a network or sub-network can use the same SSIDs. SSIDs are case sensitive and can contain up to 32 alphanumeric characters." ref: https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/www.cisco.com/content/en/us/td/docs/wireless/access_point/12-3_8_JA/configuration/guide/1238jasc/s38ssid.html.xml#:~:text=The%20SSID%20is%20a%20unique,up%20to%2032%20alphanumeric%20characters.
"SSID: This is a human-readable, non-unique identifier used by the AP to advertise its wireless service." Source: 31Days Before Your CCNA
I think the word "unique" in this question has more to do with what the SSID does the job than the value itself. Therefore, even though the SSID is not a unique value, it is the unique value that performs the establishment and maintenance of wireless connectivity to wireless network devices. Following this criterion, and discarding all the remaining answers: B is the answer.