Regarding WLAN, which of the following descriptions is correct?

Regarding WLAN, which of the following descriptions is correct?
A . WLAN Is to adopt 80211 Technical WiFi
B. WLAN There are two basic architectures: FAT AP with AC+FIT AP
C. AC+FATAP The architecture is suitable for medium and large use scenarios
D. AC+FITAP Autonomous network architecture

Answer: B