The network of a plannable product. LINT: LEGACY_NAMES

| Enums ||
|---|---|
| `PLANNABLE_NETWORK_UNSPECIFIED` | Not specified. |
| `PLANNABLE_NETWORK_YOUTUBE` | YouTube. |
| `PLANNABLE_NETWORK_GOOGLE_VIDEO_PARTNERS` | Google Video Partners. |
| `PLANNABLE_NETWORK_YOUTUBE_AND_GOOGLE_VIDEO_PARTNERS` | YouTube and Google Video Partners. |