单项选择题
Toprovideefficientroamingbetweenthecells，whichpercentofcelloverlapisrecommendedfor2.4GHzand5GHzaccesspoints？（）
- A.5to10percentforboth2.4GHzand5GHz
B.10percentforboth2.4GHzand5GHz
C.20percentfor2.4GHzand15to20percentfor5GHz
D.20percentfor2.5GHzand10percentfor5GHz
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