Which of the Following Is a Purpose of the Preview

Which of the following is a purpose of the preview in a presentation?

A) To broaden the message enough to accommodate everyone's interests
B) To provide examples, illustrations, analogies, and quotations to support the main point
C) To identify the key decision makers in your audience
D) To provide a recap of the key messages
E) To show how your audience will benefit from the idea you are proposing