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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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