A patient with kidney failure can be given a kidney transplant. In a kidney transplant, a healthy kidney is taken from another person and put into the patient's body. Sometimes the donated kidney cells are killed by the patient's body. In this primary immune response, T-lymphocytes bind to antigens on the donated kidney cells and are activated. The statements describe the next stages of the primary immune response. 1 Activated T-lymphocyte secretes cytokines. 2 B-lymphocytes differentiate into plasma cells and make antibodies. 3 T-killer cells bind to antigens on donor kidney cells. 4 T-killer cells release toxins that destroy the donor kidney cells. 5 T-lymphocytes multiply by mitosis and differentiate into T-killer cells. Which order correctly explains how donor kidney cells are killed?