11. Studies show that prior exposure to donor MHC molecule leads to accelerated graftrejection. What can you conclude based on this outcome?A. T lymphocytes can mediate graft rejection.B. B lymphocytes can mediate graft rejection.C. Graft rejection shows memory and specificity.D. Both B and T lymphocytes mediate graft rejection.E. Graft rejection is mediated by the innate immune system.