What's the Difference Between Cost-Per-Click (CPC) Bidding and Cost-Per-View (CPV)

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

A) The advertiser pays for a click on her YouTube channel with CPC bidding, and pays for a conversion with CPV bidding
B) The advertiser pays for a click on an ad with CPC bidding, and pays when someone engages with the content - for example by clicking Install or watching the first 30 seconds of the ad - with CPV bidding
C) 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
D) The advertiser pays for an impression with CPC bidding, and pays when someone watches at least 5 seconds of the ad with CPV bidding