How to switch between open applications.
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Alt + Tab
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Alt + double-click
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Ctrl + Tab
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Ctrl + Esc
A
Correct answer
Explanation
Alt + Tab is the standard Windows keyboard shortcut to cycle through open applications. Holding Alt and repeatedly pressing Tab moves the focus between running programs, releasing both keys switches to the selected application. Ctrl + Tab is used within applications to switch between document tabs or child windows, not between applications.