What’s the benefit of opting into Google Video partners for a Google Video campaign with an awareness goal?

Extending the reach of video ads to YouTube Live streaming and Premieres.
Extending the reach of video ads to a collection of leading publisher sites and apps.
Providing access to more engagement metrics to measure the impact of the campaign.
Providing access to engage with audiences on the YouTube mobile homepage.

The correct answer is:

Extending the reach of video ads to a collection of leading publisher sites and apps.