When evaluating a patient with valvular heart disease, which of the following statements is not true?
a) "Valvular heart disease can lead to heart failure if left untreated."
b) "Valvular heart disease may present with symptoms of shortness of breath and fatigue."
c) "Valvular heart disease can only affect one heart valve at a time."
d) "Valvular heart disease can be diagnosed using echocardiography."