What conditions need to be met for the addition of ESAs to be appropriate to stimulate red blood cell production in a patient with cancer?
a) Hemoglobin levels below 12 g/dL and no iron deficiency
b) ANC < 500 cells/mm³ for more than 7 days
c) Platelet count below 50,000/mm³
d) White blood cell count above 10,000/mm³