What is the intended use for the WLAN hardware known as a pole or mast mount unit?

A.
Mounting a lightning arrestor to a grounding rod

B.
Mounting an omnidirectional antenna to a mast

C.
Mounting an RF amplifier to a dipole antenna

D.
Mounting a PoE injector to a perforated radome

E.
Mounting an access point to a site survey tripod