Which of the following describe m cells in the gut? (select all that apply.) a. they derive their name from mucus cells. b. they are located in the dome of a peyer’s patch. c. they deliver antigens and pathogens from the lymphoid tissue to the luminal side of the gut mucosa by transcytosis. d. they are protected from digestive enzymes by a thick glycocalyx and a layer of mucus. e. they do not directly participate in antigen processing or presentation.