Which type of presentation includes activity recorded on a computer,with an audio voiceover?

A) Webcasts
B) Screencasts
C) Twebinars
D) Backchannels
E) Nonlinear presentations

The type of presentation that includes activity recorded on a computer with an audio voiceover is a screencast. A webcast is typically a live video broadcast over the internet, a twebinar is a webinar conducted over Twitter, a backchannel is a separate conversation happening amongst audience members during a presentation, and nonlinear presentations are presentations that allow the user to navigate through the content in a non-linear order.