13. A patient with unstable angina is lacking high risk features which would warrant an early invasive approach and thus an initial conservative strategy is undertaken. Which of the following diagnostic tests are reasonable for risk stratification?

A. Echocardiography

B. Myocardial perfusion imaging after treadmill exercise

C. Dobutamine stress echocardiography

D. Regadenoson myocardial perfusion imaging

E. All of the above are appropriate