Which of the following statements is true about Ad Hoc mode in wireless networking?

Select one:

a$.$ It requires at least three wireless NICs to create a network.

b$.$ It is the most secure way to install wireless $802\mathrm{.}11$ devices.

c$.$ It requires an access point $($AP$)$ for wireless devices to communicate.

d$.$ It is also known as an Independent Basic Service Set $($IBSS$).$