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Which information does the Conversion Optimizer need in order to find the optimal cost-perclick (CPC) bid for an ad each time the ad is eli...

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

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

A) Manual bid changes
B) Historical conversion data 
C) Test conversions
D) Forecast data