Select all that occur during activation of cytotoxic T-lymphocytes. *****Select All That Apply***** a) The TCR binds a peptide displayed with an MHC class I molecule of an infected cell. b) Clones of the cytotoxic T-lymphocyte are produced. c) CD4 helps stabilize the interaction between the TCR and MHC class I molecule. d) Second stimulation involves binding of interleukin-2 from other cytotoxic T-lymphocytes..