Short PR interval followed by QRS >120 ms with a slurred initial deflection representing early ventricular activation via the bundle of Kent suggests: a) Wolff-Parkinson-White (WPW) syndrome b) Atrioventricular nodal reentrant tachycardia (AVNRT) c) Atrioventricular reentrant tachycardia (AVRT) d) Junctional tachycardia