Which of the following statements is incorrect ?

UNIX operating system is available on machines with a wide range of computing power, from microcomputers to mainframes.

UNIX is a multi-user system designed to support a group of users simultaneously.

UNIX uses a hierarchical file structure to store information.

At the core of UNIX is the shell, a program controlling the computer's resources.

UNIX has facilities called pipes and filters which permit the user to create complex programs from simpler programs.

Answer:
At the core of UNIX is the shell, a program controlling the computer's resources.

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