What information does the Conversion Optimizer need in order to find the optimal cost-per-click (CPC) bid for an ad each time the ad is eligible to appear?

What information does the Conversion Optimizer need in order to find the optimal cost-per-click (CPC) bid for an ad each time the ad is eligible to appear?

  • Manual bid changes
  • Historical conversion data
  • Test conversions
  • Forecast data