What is the purpose of signature files used to secure mobile devices and operating systems?

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What is the purpose of signature files used to secure mobile devices and operating systems?

They contain a record of historical and pending firmware and software updates.
They contain a list of all user passwords.
They contain a log of digital certificates and encryption keys associated with the user.
They contain sample code from known viruses and malware that is used by security software to identify malicious software.

Explanation: Antivirus and antimalware software compare the contents of a disk with sample virus and malware code included in signature files. If a comparison is found, the user can be notified and the virus can be isolated or removed.

What is the purpose of signature files used to secure mobile devices and operating systems?

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