For an ad entering an auction on the Display Network, the AdWords system will calculate the effective cost–per–thousand impressions (eCPM) when there are:

1. only viewable cost–per–thousand impressions (vCPM) ads entering the auction
2. any cost–per–click (CPC) or cost–per–acquisition (CPA) ads entering the auction
3. both cost–per–click (CPC) and cost–per–acquisition (CPA) ads entering the auction
4. only cost–per–click (CPC) ads entering the auction

100% Correct Answer

• any cost–per–click (CPC) or cost–per–acquisition (CPA) ads entering the auction