All of the following are true about telepresence except:

a$.$ Telepresence includes the use of remote$-$controlled, audio$-$visual robots with wireless internet connectivity, such as a wheeled

b$.$ Telepresence rooms are environments that offer videoconferencing that allow students to feel like they are in the same room

c$.$ Telepresence does not require retrofitting classrooms and equipment

d$.$ Telepresence incorporates network convergence and virtual reality