C. Patch and panel
CHAPTER 4 - PAGE 141 (Official Study Guide)
"MIMO APs use internal omni-directional or SEMI-DIRECTIONAL (page 137) antennas and, when external antennas are supported, may use PATCH or PANEL antenna arrays."
C, since Patch and Panel are used also used indoors
Dipole is not directional and the other options are uncommon for indoor used.
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