$802\mathrm{.}11$n uses MIMO. How does this optimize throughput to gain the high$-$speed advantage that $802\mathrm{.}11$n provides?

Group of answer choices

One frame at a time is sent, but faster than in $802\mathrm{.}11$g because multiple antennas are used $($multiple$-$in$,$ multiple$-$out$).$

Several frames are sent by several antennas over several paths and are then recombined by another set of antennas.

By specifying an acknowledgment of each and every frame, $802\mathrm{.}11$n provides better overhead.

MIMO packs smaller packets into a single unit, which improves throughput.