<prompt>  A 42 -year old man was referred with a 2-week history of fever weakness and bleeding gum. Peripheral smear showed pancytopenia. The bone marrow examination revealed 26 blasts frequently exhibiting Auer rods and mature myeloid cells. An occasional neutrophil with pseudo-Pelger-Huet anomaly was also noted: Which of the following cytochemical stains is most likely to be positive?Acid phosphataseNon specific esteraseMyeloperoxidaseToluidine blue 