A licensee can ask the Administrative Law Judge to subpoena the witness to testify. A subpoena is a court order that requires a person to appear in court and testify. The request for a subpoena must be made in writing and must state the name, address, and telephone number of the witness, and the reason for the request. The requesting party must mail the request to all other interested parties and to the witness at the time of filing. If the witness fails or refuses to appear at a hearing or to testify, the judge may file a petition in United States District Court for issuance of an order requiring the subpoenaed person to appear and testify.
Therefore, option A is correct.
Hope this helped :)