At what data rate was the PHY Preamble transmitted?

When performing protocol analysis, you capture an 802.11ac data frame on channel 52, transmitted at MSC 8.

At what data rate was the PHY Preamble transmitted?

A. 54 Mbps

B. 6 Mbps

C. 86.7 Mbps

D. 78 Mbps

Answer: B

Explanation:The transmitter sends the preamble at 1 Mbps (802.11 or 802.11b DSSS) or 6 Mbps (802.11a or 802.11g ERP-OFDM).

Reference: http://mediA.techtarget.com/searchMobileComputing/downloads/CWAP_ch8.pdf