Creates an audience in the workspace. New audiences start empty: add members with [Add contacts to an audience](/docs/api/reference/assign-audience-contacts) or through [Create or update contacts in bulk](/docs/api/reference/create-contact-batch). Only `static` audiences can be created today; requesting `dynamic` or `external` returns a validation error. 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` 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`