The strategy to use for displaying multiple creatives that are associated with a line item.

| Enums ||
|---|---|
| `CREATIVE_ROTATION_TYPE_UNSPECIFIED` | No value specified. |
| `EVENLY` | Creatives are displayed approximately the same number of times over the duration of the line item. |
| `OPTIMIZED` | Creatives are served approximately proportionally to their performance. |
| `SEQUENTIAL` | Creatives are served exactly in sequential order, aka Storyboarding. Set on the LineItemCreativeAssociation. |
| `WEIGHTED` | Creatives are served approximately proportionally to their weights, set on the LineItemCreativeAssociation. |