What information does a target cost-per-acquisition (CPA) bid strategy need in order to find the optimal cost-per-click (CPC) bid for an ad each time it's eligible to appear?

What information does a target cost-per-acquisition (CPA) bid strategy need in order to find the optimal cost-per-click (CPC) bid for an ad each time it's eligible to appear?

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


Correct Answer is :
•               Historical conversion data



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