The conciliation proceedings may be terminated as to all parties by any of the following:
(a) A written declaration of the conciliator or conciliators, after consultation with the parties, to the effect that further efforts at conciliation are no longer justified, on the date of the declaration.
(b) A written declaration of the parties addressed to the conciliator or conciliators to the effect that the conciliation proceedings are terminated, on the date of the declaration.
(c) The signing of a settlement agreement by all of the parties, on the date of the agreement.