A direct response advertiser is primarily interested in generating conversions from a display campaign. To get the best return on investment, this advertiser should use:
- Ad Scheduling
- cost-per-day (CPD)
- Target CPA Bidding
- cost-per-thousand impressions (CPM) bidding
The correct Answer is: Target CPA Bidding
Explanation: If a direct response advertiser is primarily interested in generating conversions from a display campaign, this advertiser should use Target CPA Bidding to get the best return on investment. An automated bid strategy that sets bids to help get as many conversions as possible at the target cost-per-acquisition (CPA) you set.
Note: Conversion Optimizer is now Target CPA bidding
Read more here: https://support.google.com/adwords/answer/2390684