A "stipulation" means an agreement among parties intended to establish one or more operative facts in a proceeding.

(1) Parties may stipulate to all or any portion of the facts of the case.

(2) Parties may file the stipulation in writing or enter it orally into the record.

(3) A stipulation, if the presiding officer accepts it, is binding on the stipulating parties. The parties may present the stipulation as evidence at the hearing.

(4) The presiding officer may reject the stipulation or require proof of the stipulated facts, despite the parties' agreement to the stipulation.