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单选题
If there is an existing 802.11g WLAN at a site， which service can be provided without conducting anew site survey？（）
A
Add a new 802.11a WLAN
B
Increase the Layer 2 and Layer 3 security of the WLAN
C
Increase the throughput for the wireless clients
D
Add new services （such as voice） over the WLAN
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