Which Characteristic of a Web-Delivered Presentation Is NOT Essential

Which characteristic of a web-delivered presentation is NOT essential?

A) Use of a Web-presentation platform.
B) A presenter who controls the remote delivery of visual aids to the audience's computer while speaking to the audience via computer or a controlled-access phone line.
C) Audience rapport affecting the logos of the presentation and the shorter period needed for planning.
D) Audience ability to ask questions and the ability of the presenter to respond to those questions.
E) An invited audience who participates via the Web from their office or a Web-equipped room.