What is a desirable characteristic of a Microsoft® PowerPoint® presentation with audio?

a) The audio recording repeats slide content to ensure the audience hears the full presentation.
b) The audio recording serves as a complement to the slide content, using the audio to expand rather than to repeat.
c) The content on the slides should dominate the presentation with the audio being largely secondary.
d) Continue speaking even as slides are being advanced. Your viewer will catch up.