- Manual Max CPC
- Maximize Clicks
- Enhanced CPC
- Target Return On Ad Spend (tROAS)
The correct answer is: Target Return On Ad Spend (tROAS)
Explanation: If you’re using Performance Max for conversion value but are concerned about inefficient spend, an optimal secondary bid strategy would be Target Return On Ad Spend (tROAS). This strategy automatically sets bids to achieve as much conversion value as possible at your set return on ad spend, thereby enhancing the efficiency of your campaign spend.