To measure the full value of an action campaign, Cross-platform and view-based are the two conversion types that you should capture in your reporting.

• Mono-platform and view-based
• Mono-platform and last click
• Cross-platform and last click
• Cross-platform and view-based 

The correct answer is: Cross-platform and view-based

Explanation: To accurately measure the full value of an action campaign, it is crucial to track two conversion types in your reporting: cross-platform conversions and view-based conversions. Cross-platform conversions account for user interactions and conversions occurring across different devices and platforms, while view-based conversions capture user engagement, such as watching at least 10 seconds of an ad or seeing an impression, leading to a conversion. By capturing both of these conversion types, you can gain a comprehensive understanding of your action campaign’s effectiveness and optimize your strategies accordingly.