What’s the difference between cost-per-click (CPC) bidding and cost-per-view (CPV) bidding?

The advertiser pays for an impression with CPC bidding, and pays when someone watches at least 5 seconds of the ad with CPV bidding
The advertiser pays for a click on an ad with CPC bidding, and pays when someone engages with the content — for example by clicking clicking a call to action or watching the first 30 seconds of the ad — with CPV bidding
The advertiser pays for a click on her YouTube channel with CPC bidding, and pays for a conversion with CPV bidding
The advertiser pays for a click that brings someone to her website with CPC bidding, and pays when there’s an impression with CPV bidding

The correct answer is:

The advertiser pays for a click on an ad with CPC bidding, and pays when someone engages with the content — for example by clicking clicking a call to action or watching the first 30 seconds of the ad — with CPV bidding.