A 50-year-old construction worker presents with progressive exertional chest tightness relieved by rest. Resting ECG is normal. According to Canadian stable angina guidelines, what is the most appropriate initial non-invasive test?ACoronary CT angiography in all casesBExercise treadmill ECG test if he can exercise adequately and has interpretable ECGCInvasive coronary angiography immediatelyDNo testing; empiric long-acting nitrates onlyEMyocardial biopsyCheck my answer