- both cost-per-click (CPC) and cost-per-acquisition (CPA) ads entering the auction
- any cost-per-click (CPC) or cost-per-acquisition (CPA) ads entering the auction
- only cost-per-click (CPC) ads entering the auction
- only cost-per-thousand impressions (CPM) ads entering the auction
The correct answer for the above question is:
Here you can read the explanation