多选题Which two statements about the Wi-Fi Multimedia （WMM） standard are true？（）ALower-priority traffic is assigned short interframe wait-timers to allow higher-priority traffic access to the wireless network first.BPackets that are not assigned to a specific access category are categorized by default as the background access category.CThe WMM standard was implemented after the 802.11e standard was approved to provide support for non 802.11e devices.DWMM is a Wi-Fi Alliance standard that was implemented before the 802.11e standard was approved.EWMM uses Enhanced DCF （EDCF） to stipulate fixed and random wait times for the different access classes.
多选题
Which two statements about the Wi-Fi Multimedia （WMM） standard are true？（）
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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