Which process would describe the generation of clonal diversity? Select all that apply. One, some, or all responses may be correct. Production of lymphocytes before birth that are capable of recognizing 1016 different antigens Activation and regulation of the immune response by T helper cells Extensive diversity of antigen receptors on B and T cells is established Activation of memory cells if a second exposure occurs with the same antigen Production of self-reactive lymphocytes which are later removed from the body via clonal deletion