Which of these factors affect whether a Search ad shows in the results for a query and what position it assumes?

Question

Accepted Answer

Ad Rank does this, and it’s based on a variety of factors to show useful ads.

Answer

Bids does this and it’s determined by how much marketers will pay for a click.

Answer

Ad quality does this, and it’s based on ad and website relevance.

Answer

Asset impact does this, and it’s based on sitelinks and image assets.