The interspecific relationship witnessed between clownfish and sea anemones has proven a vivid example of symbiosis in tropic waters. Scientists have adjusted their view of the relationship after years of observance. The venomous sea anemone undoubtedly provides a refuge for the mucus-coated clownfish, impervious to cnidarian harm.
Larger predatory fish do not disturb the clownfish amidst the stinging tentacles. However, it appears not only do the anemones most likely feed on the detritus (decaying tissue remains) of the clownfish's meal, but the swimming patterns of the fish presumably improve circulation for its partner, increasing oxygen supply.
Which of the following types of symbiosis was once identified between the sea anemone and clownfish, and which is currently accurate with the described interaction?