When would you use Insights Finder and Find My Audience?

When you’re looking to create audience lists that you can immediately apply to any of your Google Video campaign.
When you’re looking to understand what audience solutions in an existing campaign are delivering the best results.
When you’re looking to create audience lists similar to the audiences who delivered the best results in your Google Video campaign.
When you’re looking to understand who your most valuable customers are on YouTube and how to reach them.

The correct answer is:

When you’re looking to understand who your most valuable customers are on YouTube and how to reach them.