Which of the following better describes cross-presentation of protein antigens by professional antigen-presenting cells to naïve TC cells?

A) Presentation of intracellular antigens by class I MHC proteins
B) Presentation of intracellular antigens by class II MHC proteins
C) Presentation of extracellular antigens by class I MHC proteins
D) Presentation of extracellular antigens by class II MHC proteins