Recognition of self vs. non-self by the adaptive immune system in humans is accomplished in which of the following ways?

• A. Exposure of B cells to the body s own antigens in the thymus
• B. Exposure of B cells to the body s own antigens in the bursa of Fabricius
• C. Exposure of T cells to the body s own antigens in the bursa of Fabricius
• D. Exposure of T cells to the body s own antigens in the thymus