Here are four statements about Major Histocompatibility Complex (MHC).
A. MHC-I is expressed by nearly all nucleated cells
B. MHC-II is expressed by antigen presenting cells and they present antigen to cytotoxic T cells
C. Only Helper T cells and not the cytotoxic T cells can recognize antigen in complex with MHC-II
D. Natural Killer cells express a variety of receptors that engage with MHC-II
Which of the above statement(s) is true?