Correct answer are
Explanation: In the Rotation drop-down, select a dynamic rotation option. Rotation options only apply when the filtering rule or dynamic strategy above results in more than one eligible row. For example, if you’re geo-targeting feed that includes more than one eligible row for Paris, choose a rotation option to decide which row to serve.
- Optimized rotation: Over time, the best-performing rows are selected more often
- Random rotation: Rows are selected randomly
- Weighted rotation: Rows are selected according to their proportional weight over the total eligible for the impression
Read more here:https://support.google.com/richmedia/answer/2871761