This question addresses the procedural response to a party's non-appearance in a hearing. The correct answer is 'Proceed ex-parte'. This means the Hearing Officer can continue the proceedings and make a decision based on the evidence presented by the appearing party, preventing undue delays caused by a party's absence after proper notice.
'Dismiss the matter for default' is typically reserved for when the complainant fails to appear, not necessarily any party.
'Issue a warrant for arrest' is an extreme measure, usually for criminal contempt or specific criminal proceedings, not standard for non-appearance in administrative hearings.
'Close the case permanently' is too absolute; proceeding ex-parte allows for a decision while potentially leaving room for reconsideration if good cause is later shown.