Target CPA bidding can help drive conversions by using your conversion history

Target CPA bidding can help drive conversions by using your conversion history and: OR
Target cost-per-acquisition (CPA) bidding can help drive conversions by using your conversion history and:

=>> cost-per-acquisition (CPA) goals to show the optimal ad when a conversion is more likely
=>> cost-per-click (CPC) goals to show the optimal ad when a conversion is more likely 
=>> cost-per-acquisition (CPA) goals to raise your bid when a conversion is more likely
=>> cost-per-click (CPC) goals to raise your bid when a conversion is more likely

Right answer is:

=>> cost-per-acquisition (CPA) goals to raise your bid when a conversion is more likely

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