Identify Which of the Following Statements Is True Regarding the Transporter

Identify which of the following statements is true regarding the transporter associated with antigen processing (TAP) .

A) TAP is a homodimer composed of two identical subunits.
B) TAP transports proteasome-derived peptides from the cytosol directly to the lumen of the Golgi apparatus.
C) TAP is an ATP-dependent,membrane-bound transporter.
D) Peptides transported by TAP bind preferentially to MHC class II molecules.
E) TAP deficiency causes a type of bare lymphocytes syndrome resulting in severely depleted levels of MHC class II molecules on the surface of antigen-presenting cells.