What is the recommended data rate with -67 dBm signal level for optimal VoWLAN design?

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An engineer has performed a predictive site survey for high-speed data and voice in an indoor office.

What is the recommended data rate with -67 dBm signal level for optimal VoWLAN design?
A . 6 Mbps on 802.11 bgn
B . 24 Mbps on 802.11 bgn
C . 12 Mbps on 802.11 an
D . 24 Mbps on 802.11 an

Answer: B