Computer Basic Information
Which one of the following would be considered as a way that a computer virus can enter a computer system?

Opening an application previously installed on the computer
Running antivirus programs
Viewing a website without causing any additional transactions
None of these
Borrowed an illegal copy of software

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Computer Basic Information
The MS-DOS operating system is a .....

command-driven interface, single-tasking operating system
graphical user interface, multi-tasking operating system
command-driven interface, multi-tasking operating system
None of these
graphical user interface, single-tasking operating system

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