Which Characteristic of a Web-Based Presentation Is Not Essential

Which characteristic of a web-based presentation is not essential?

A) Use of a Web presentation platform
B) A presenter who remotely controls the 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 access to type in questions throughout the presentation and the ability of the presenter to respond to questions.
E) An invited audience who participates via the Web from their office or a Web-equipped room.