How does an operating system protect the passwords used for account logins?

How does an operating system protect the passwords used for account logins?
A . The operating system performs a one-way hash of the passwords.
B . The operating system stores the passwords in a secret file that users cannot find.
C . The operating system encrypts the passwords, and decrypts them when needed.
D . The operating system stores all passwords in a protected segment of non-volatile memory.

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Answer: A