A second level of detail of content should be in a different font than the primary content.
The term "level of detail" in writing, which is also referred to as "level of abstraction," refers to three ideas: the accuracy with which the appropriate words are chosen to form phrases, clauses, and sentences; the generality of assertions; and the organizational strategy with which writers group concepts into a ranking of detail based on a standard theme.
Since, the level of detail of content is second, it must be written in different font than the primary content so that the reader can identify and differentiate the content on the basis of level of its importance.
Hence, the correct option is C.
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