In order to use target cost–per–acquisition (CPA) bidding, an advertiser must:

1. be using viewable cost–per–thousand impressions (vCPM) bidding, with a certain number of viewable impressions in the previous 30 days
2. have a certain number of conversions in the previous 30 days
3. be opted in to the Search Network and YouTube
4. be opted in to the Search Network

Correct Answer:
have a certain number of conversions in the previous 30 days