A wireless engineer at a convention center has been asked to provision an SSID that can accommodate 4,000 users during a conference. Which interface group configuration should be used?

A wireless engineer at a convention center has been asked to provision an SSID that can accommodate 4,000 users during a conference. Which interface group configuration should be used?
A . One interface with /20 mask
B . Two interfaces with /21 mask
C . Four interfaces with /22 mask
D . Eight interfaces with /23 mask

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Answer: D