Which selection displays the incorrect method for shutting down a computer?

The selection highlighting the method for shutting down a computer that is incorrect is the one related to Linux and the practice of "pulling the plug." Properly shutting down a Linux operating system involves using command line tools or graphical user interface options specifically designed for shutting down the system. This ensures that all processes terminate correctly and that the filesystem is properly unmounted, preventing potential data loss or corruption.

In contrast, while "pulling the plug" is noted as an improper method across multiple operating systems, it's particularly emphasized here in the context of Linux, as this practice can lead to a lack of system integrity and issues on reboot. Systems like Windows 7 and Windows XP also have user-friendly shutdown options that should be used instead of abruptly cutting power. DOS, while older and less complex, still operates under principles that advise against this method. The correct approach across all operating systems is to utilize their built-in shutdown features, ensuring that the system can safely terminate processes and prevent future problems.