<prompt> A 17 year old boy presented with total count of 138 x 109 L with 80 blasts on the peripheral smear. Chest X-ray demonstrated a large mediastinal mass. Immunophenotyping of this patients blasts would most likely demonstrate:No surface antigens null phenotypeAn immature T cell phenotype TdtD34CD7 positiveMyeloid markers, such as CD13, CD33 and CD15B cell markers, such as CD19, CD20 and CD22  <response>: . An immature I? cell phenotype TdtD34CD7 positive 