You desire to achieve a 450 Mbps MCS. What 802.11n features (from the numbered list below) are required?
1. Frame aggregation
2. Short GI
3. 40 MHz channels
4. 2 spatial streams
5. 3 spatial streams
6. Transmit beamforming (TxBF)

A.
2,3,2

B.
1, 2, 3, 5

C.
1, 2, 3, 4, 6

D.
2,3,5