In storytelling with data, the author notes in an example that the "Big Idea" and the storyboard often have a particular relationship. What is it$?$

The "Big Idea" is a summary of the storyboard.

The "Big Idea" is always completely separate from the storyboard.

The "Big Idea" is often either an opening executive summary of$/$ preamble to$,$ or a summary conclusion of$,$ the storyboard.

The "Big Idea" is often unnecessary if one plans to create a storyboard.