It Is Desirable Before a Transplant That the Donor Cells

It is desirable before a transplant that the donor cells be cross- matched with the recipient's serum to rule out preexisting antibodies in the recipient. What advantage is there in doing the cross- match by flow cytometry?

A) The equipment is less expensive.
B) Flow cytometry is more sensitive that other techniques.
C) Donor cells do not have to be viable.
D) Flow cytometry is more specific that other techniques.