- Target cost-per-acquisition (tCPA)
- Maximize clicks
- Target impression share
- Target return on ad spend (tROAS)
The Correct Answer is: Target return on ad spend (tROAS)
The performance marketer should use tROAS automated bidding strategy to drive as much purchase value as possible within a speciﬁc return on ad spend. this bid strategy analyzes and intelligently predicts the value of a potential conversion every time a user searches for products you’re advertising. Then, it automatically adjusts your bids for these searches to maximize your return on them.
In practice, this means that if it determines that a user search is likely to generate a conversion with high value, Target ROAS will bid high on that search. If it determines that the search isn’t likely to generate a high-value conversion, it’ll bid low.
Read more here: https://support.google.com/google-ads/answer/6309035