单项选择题

【案例分析题】

Password is a secret series of () that enables a user to access a file, computer, or program. On multi-user systems, each user must enter his or her password before the computer will respond to () . The password helps ensure that () users do not access the computer. In addition, data files and programs may require a password.

Password is a secret series of () that enables a user to access a file, computer, or program.

A.symbol
B.sign
C.characters
D.characteristic

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