When One Organism Feeds on Ectoparasites or Dead Tissue of Another

When one organism feeds on ectoparasites or dead tissue of another organism the relationship is considered to be

A) endoparasitism, since one organism eats other parasites.
B) ectoparasitism, since the ectoparasites are eaten.
C) cleaner-customer mutualism, since one organism gains food and the other has harmful material removed.
D) amensalism, since one organism, the ectoparasite, is negatively affected.
E) bioaccumulation, since one organism is accumulating biomass.