The registration of an inhibition shall be cancelled in the following cases and in no other—
(a) on the expiration of the time limited by the inhibition;
(b) on proof to the satisfaction of the Registrar of the occurrence of the event specified in the inhibition;
(c) on the land, lease or hypothec being sold by a creditor, unless such sale is itself inhibited; or
(d) by order of the Court.