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The UNIX sytem uses a/an ________ stored at the beginning of a some files to indicate roughly the type of file.

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The UNIX sytem uses a/an ________ stored at the beginning of a some files to indicate roughly the type of file.

(a) identifier

(b) extension

(c) virtual number

(d) magic number

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Origin of the question is File System Interface Access Methods topic in section File Systems and their Implementation of Operating System

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The correct choice is (d) magic number

The explanation: None.

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