Which one of the following statements concerning Linux passwords is true?

Which one of the following statements concerning Linux passwords is true?
A . All passwords can be decrypted using the system administrator’s master password.
B . Passwords may never start with a non-letter.
C . Users cannot change their password once it has been set.
D . Passwords are only stored in hashed form.
E . Passwords may be at most six characters long.

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Answer: D