Which of the following descriptions of abnormal file type identification results is incorrect?

Question

Options

• AThe file type cannot be recognized means that the file type cannot be recognized and there is no
• BUnrecognized file type means that neither the file type nor the file extension can be recognized.
• CFile extension mismatch means that the file type and file extension are inconsistent.
• DFile corruption refers to the inability to identify the file type due to the file being damaged.

• A
  4% (2)
• B
  82% (37)
• C
  2% (1)
• D
  11% (5)

Explanation

Option B is the incorrect description because "unrecognized file type" specifically refers to the inability to identify the file's actual type from its content or signature - it does not mean the file extension is also unrecognizable. The file extension is a separate attribute (a text label in the filename) that remains visible even when the file type itself cannot be determined.

• A is correct: "Cannot recognize file type" accurately describes a scenario where the system simply fails to identify what kind of file it is, with no matching type found.
• C is correct: "File extension mismatch" correctly captures the case where the detected file type (from file signatures/magic bytes) contradicts the file's extension - a common indicator of disguised malicious files.
• D is correct: "File corruption" accurately describes when damage to the file's structure prevents the system from reading its type information at all.

Memory tip: Think of the file extension as the label on a box and the file type as what's actually inside. "Unrecognized file type" means you can't identify the contents - but you can still read the label. B wrongly claims both are unreadable, conflating two distinct concepts.

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