What electrocardiographic criteria are indicative of a myocardial infarction?
a) ST elevation equal to or greater than 1 mm in limb leads or equal to or greater than 2 mm in precordial leads, and/or new left bundle branch block (LBBB)
b) T wave inversion in leads V1 to V4
c) Prominent U waves and prolonged PR interval
d) Presence of pathological Q waves in multiple leads