What is ad-hoc mode?

One of the connectivity options on a wireless device is ad-hoc mode. What is ad-hoc mode?

A) Allows a wireless device to connect directly to another wireless device without using an access point

B) Allows a wireless device to connect through an access point instead of directly to another wireless device

C) Allows a wireless device to communicate through an access point and directly to another wireless device simultaneously

D) Disables a wireless device from communicating through access points and all other wireless devices