Answer:
Analysis, because the writer analyzes an advertisement by examining the individual elements of the rhetorical situation, including purpose.
Explanation:
In this passage, the author focuses on explaining what the article "Breaking Down an Image" conveys. The author explains the main purpose of the article. He also analyzes the definitions and explanations that the article gives when it comes to the rhetorical situation of images. Therefore, we can conclude that the excerpt was taken from an analysis type of informative essay intended to examine advertisements.