单项选择题
WhenplanningforvoicedeploymentswiththeCiscoUnifiedWirelessIPPhone7921GhandsetinamultifloorbuildingwithaWLANthatoperatesatan11MB/sdatarate，howmanydecibelsreferencedto1milliwattofsame-channelseparationarerecommendedbetweenfloors？（）
A.13dBm
B.19dBm
C.25dBm
D.31dBm
- A.13dBm
B.19dBm
C.25dBm
D.31dBm
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