多选题
Which two statements about the Wi-Fi Multimedia （WMM） standard are true？（）
发布日期：2020-04-13
A
Lower-priority traffic is assigned short interframe wait-timers to allow higher-priority traffic access to the wireless network first.
B
Packets that are not assigned to a specific access category are categorized by default as the background access category.
C
The WMM standard was implemented after the 802.11e standard was approved to provide support for non 802.11e devices.
D
WMM is a Wi-Fi Alliance standard that was implemented before the 802.11e standard was approved.
E
WMM uses Enhanced DCF （EDCF） to stipulate fixed and random wait times for the different access classes.
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