A 4-year-old boy presents with a 2-week history of fever, pallor, and petechiae. On examination, he has hepatosplenomegaly and generalized lymphadenopathy. Complete blood count shows hemoglobin 7.2 g/dL, WBC 85,000/μL with 60% blasts, and platelets 35,000/μL. Which is the investigation of choice to confirm the diagnosis and determine the subtype of leukemia?

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