Which feature on an 802.11n AP provides better performance to legacy devices?

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A company has all IEEE 802.11a/802.11g devices; however, its network administrator recommends installing 802.11n access points to provide greater performance.

Which feature on an 802.11n AP provides better performance to legacy devices?
A . channel aggregation
B . transmit beam-forming
C . maximal-ratio combining
D . spatial multiplexing

Answer: B