A 14-Year-Old Male Presents with a Mediastinal Mass, a WBC $\times$

A 14-year-old male presents with a mediastinal mass, a WBC of 110 $\times$ 10⁹/L, hepatosplenomegaly, and early central nervous system involvement. Both L1 and L2 morphology are seen, and surface markers CD7, CD2, and CD5 are expressed. Which type of ALL is present?

A) Precursor B-cell
B) T-cell
C) B-cell
D) Null cell
E) None of the above