In a 12-year-old boy, which of the following is the best statement regarding aoic valve stenosis?

The patient should be restricted from Patients with aoic valve stenosis have an increased risk for sudden death during exercise due to myocardial ischemia and arrhythmias secondary to increased myocardial work with less blood supply. In all cases except mild aoic stenosis, restriction from athletics is recommended. Patients with aoic valve stenosis are at risk for endocarditis, and therefore prophylaxis is recommended. The electrocardiogram may show left ventricular hyperophy due to the increased left ventricular mass, but not right ventricular hyperophy. The aoic valve usually has fused commissores, a thickened valve, or both; calcification of the valve is usually not present until adulthood.