The best strategy for treating a specific type of human tumor can depend on identifying the type of cell that became cancerous to give rise to the tumor. For some tumors that have metastasized (moved) to colonize a distant location, identifying the parental cell type can be difficult. Because the type of IF protein expressed is cell-type specific, using monoclonal antibodies that react with only one type of IF protein can help in this identification. Monoclonal antibodies against what IF proteins would you use to identify

a) A sarcoma of muscle cell origin

b) An epithelial cell carcinoma, and

c) An astrocytoma?