The three use cases for the Privacy Sandbox are re-engaging audiences, performance measurement, and interest-based advertising.

• Gaining customer consent
• Re-engaging audiences
• Performance measurement
• Interest-based advertising

The correct answers are: Re-engaging audiences, Performance measurement, and Interest-based advertising

Explanation: The Privacy Sandbox supports several key advertising use cases. It helps in re-engaging audiences through the FLEDGE API, measures performance with the Attribution Reporting API, and facilitates interest-based advertising via the Topics API. These technologies are designed to protect user privacy while enabling effective advertising strategies by providing tools that replace traditional third-party cookies.

Reference article: Third-Party Cookie Deprecation: Privacy Sandbox Spotlight