When planning for voice deployments with the Cisco Unified Wireless IP Phone 7921G handset in a multifloor building with a WLAN that operates at an 11 MB/s data rate, how many decibels referenced to 1 milliwatt of same-channel separation are recommended between floors?
A.
13 dBm
B.
19 dBm
C.
25 dBm
D.
31 dBm