Any party may apply for a protective order to close part of a hearing. The party making the request shall state the reasons for making the application to the presiding officer, and serve copies on all other parties. If another party opposes the request, a written response to the request shall be made within ten days of the request to the presiding officer. The presiding officer shall determine which, if any, parts of the proceeding shall be closed, and state the reasons in writing within twenty days of receiving the request.