What do Insights Finder and Find My Audience help you do?

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

The correct answer is:

They help you understand who your most valuable customers are on YouTube and how to reach them.