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

Which of the following descriptions of abnormal file type identification results is incorrect?
A . The file type cannot be recognized means that the file type cannot be recognized and there is no file extension.
B . Unrecognized file type means that neither the file type nor the file extension can be recognized.
C . File extension mismatch means that the file type and file extension are inconsistent.
D . File corruption refers to the inability to identify the file type due to the file being damaged.

Answer: B