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The action that is typically performed by the Command key combined with a period (Command + .) is to select Cancel. This keyboard shortcut is commonly used in macOS applications during various operations, such as dialogs, where a cancellation option is available. When this shortcut is pressed, it effectively allows the user to exit a process, such as closing an open dialog box or stopping a current action without making any changes.

In macOS, keyboard shortcuts are designed to enhance productivity and efficiency by providing quick and easy ways to perform actions. The Command key is central to these shortcuts, and combining it with specific keys facilitates various functions. The behavior of Command + . can vary slightly between different applications, but its primary purpose remains consistent in the context of cancelling operations.

The other options, while showcasing common shortcuts, do not correctly reflect the action associated with Command + .. For example, copying an item is typically done with Command + C, opening a new window is usually Command + N, and closing the current application is generally done with Command + Q. Understanding these distinctions is essential for effective use of macOS and achieving efficiency in tasks.