Which two statements are true about WiMAX technology?

Which two statements are true about WiMAX technology? (Choose two.)

A.
WiMAX is defined by 802.11i.

B.
Typically, fixedWiMAX networks have a higher gain direction antenna installed near the client.

C.
WiMAX is capable of working as a long-range system over several miles.

D.
WiMAX works only for licensed frequencies.