Creates a new option or updates an existing option for the given drop-down user field. To update an option, include the id of the option in the `custom_field_option` object. Example: `{"custom_field_option": {"id": 10002, "name": "Pineapples", ... }`. If an option exists for the given ID, the option will be updated. Otherwise, a new option will be created. #### Response Returns one of the following status codes: - 200 with `Location: /api/v2/user_fields/{user_field_id}/options.json` if the user field option already exists in the database - 201 with `Location: /api/v2/user_fields/{user_field_id}/options.json` if the user field option is new #### Allowed For * Admins