Which of the following statement about the description of the Linux base directory is incorrect?

Which of the following statement about the description of the Linux base directory is incorrect?
A . In the base directory, "." (a dot) represents the current directory
B . In the base directory, ".." (two points) represents the upper level directory
C . The directory beginning with "." (a dot) is a hidden directory
D . The "cd.." command can be returned to the previous directory, and ls -| can display the hidden directory.

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Answer: D