Which three elements define the 802.11n implementation of MIMO?

The IEEE 802.11n standard provides 40-MHz channels, improved MAC efficiency, and MIMO.
Which three elements define the 802.11n implementation of MIMO? (Choose three.)
A. channel bonding
B. dynamic frequency selection
C. maximal ratio combining
D. packet aggregation
E. spatial multiplexing
F. transmit beam forming

Answer: C, E, F

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