The technology of 802.11n compared to 802.11a/b/g, which of the following advantages include?

The technology of 802.11n compared to 802.11a/b/g, which of the following advantages include?
A . the maximum theoretical transmission rate up to 600 MBPS
B . downward compatible with 802.11a/b/g protocols
C . support MIMO technology
D . the above are all correct

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Answer: C