You manage a WLAN with 100 802.1lac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

You manage a WLAN with 100 802.1lac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?
A . The short guard interval is also enabled
B . The clients are all 802.11n STAs or lower
C . The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
D . All clients implement single spatial stream radios

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Answer: B