Scope to apply the assets to.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/services/recommendation_service.proto)

| Enums ||
|---|---|
| ## `CAMPAIGN` | Apply at the campaign scope. |
| ## `CUSTOMER` | Apply at the customer scope. |
| ## `UNKNOWN` | Unknown. |
| ## `UNSPECIFIED` | The apply scope has not been specified. |