Returns a single audience: its name, description, and type. The member list is separate; fetch it with [List an audience's contacts](/docs/api/reference/list-audience-contacts). ID of the audience to fetch (`adn_`-prefixed). ID of the audience (`adn_`-prefixed), accepted by every operation that takes an `audience_id`. Display name for the audience. Longer description of who this audience is. How the audience's recipients are determined. `static` (the default) is an explicit member list you manage via the API. `dynamic` and `external` are preview values and currently unavailable; creating an audience with either returns a validation error. Possible values: `static`, `dynamic`, `external`