Right of Attorney General to appeal

676(1) The Attorney General or counsel instructed by him for the purpose may appeal to the court of appeal (a) against a judgment or verdict of acquittal or a verdict of not criminally responsible on account of mental disorder of a trial court in proceedings by indictment on any ground of appeal that involves a question of law alone; (b) against an order of a superior court of criminal jurisdiction that quashes an indictment or in any manner refuses or fails to exercise jurisdiction on an indictment; (c) against an order of a trial court that stays proceedings on an indictment or quashes an indictment; or (d) with leave of the court of appeal or a judge thereof, against the sentence passed by a trial court in proceedings by indictment, unless that sentence is one fixed by law.