• Maximize Clicks
• Manual Max CPC
• Enhanced CPC
• Target Return On Ad Spend (tROAS)

The correct answer is: Target Return On Ad Spend (tROAS)

Explanation: Performance Max campaigns offer two optional secondary bid strategies to accompany the primary Maximize Conversion Value bid strategy: CPA target and tROAS. Among them, Target Return On Ad Spend (tROAS) is specifically designed to achieve maximum conversion value, set at a determined return on ad spend. The added advantage of tROAS is its capacity to integrate offline performance metrics, such as store visits, thus encompassing an omnichannel approach to performance evaluation.