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B. the first several bytes of the file
D is not correct
because file headers typically occupy more than just a single byte. File headers contain important metadata about the file, such as its format, size, or other identifying information. This information usually takes up several bytes, not just one. That's why option B (the first several bytes of the file) is the correct answer, as it accurately reflects that file headers occupy a larger portion of the file's beginning.
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