Mediation for a farm business debt has been
"satisfactory" if—
(a) as a result of the mediation, the farmer and the mortgagee have entered into a heads of agreement; or
(b) the mediation has proceeded as far as it reasonably can with the farmer and the mortgagee having participated in good faith, but they have not entered into a heads of agreement; or
(c) the mediation is of a type, or a class, or meets criteria prescribed by regulation for this paragraph.