Which best describes the relationship between maximum cost-per-click (CPC) bids and Ad Rank?

Google adwords fundamental / By SEO And Web Service / March 30, 2016 May 26, 2020

An increased CPC bid leads directly to a small increase in Ad Rank.
CPC bid only affects Ad Rank on the Search Network.
An increased CPC bid leads directly to a large increase in Ad Rank.
CPC bid is one factor that affects Ad Rank.