A 4-year-old boy presents with a 2-week history of fever, pallor, and petechiae. Complete blood count shows hemoglobin 7.2 g/dL, WBC 45,000/µL with 85% blasts, and platelets 20,000/µL. Bone marrow aspiration confirms acute leukemia. What is the most common type of acute leukemia in this age group?

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