Final answer:
Barry's essay includes anecdotes, statistics, and quotations, but not algorithms. Anecdotes establish credibility, statistics offer logical evidence, and quotations provide authority, unlike algorithms which are not mentioned as used in his essay.
Step-by-step explanation:
The student's question relates to the different types of evidence and rhetorical strategies that one might use in writing an essay. To address the student's query, Barry includes anecdotes, statistics, and quotations in his essay, but there's no mention of him using algorithms. Anecdotes are often employed by writers like Kumar and Desmond to establish credibility and support their points with illustrative stories. On the other hand, statistics are used to provide logical evidence and appeal to readers who respond to quantitative data. Moreover, quotations may be used to draw on authority or expertise from other sources. Algorithms, typically associated with computational or mathematical processes, are not indicated as a strategy used by Barry in his essay.