Apple Certified Support Professional (ACSP) Practice Exam 2026 - Free ACSP Practice Questions and Study Guide

The command that allows you to take a screenshot of an open window is Command Shift 4 followed by pressing the Spacebar. This combination first activates the screenshot tool, allowing you to select a specific area of the screen. Once you press the Spacebar, the cursor changes to a camera icon, enabling you to click on any open window to capture it. This method is particularly useful for obtaining screenshots of specific applications or dialogs without needing to capture the entire screen or multiple windows at once.

The other options provided do not perform the function of capturing a screenshot of an open window. Command Shift 3 captures the entire screen, which is a different purpose. Command Shift H is used for navigating to the home directory in Finder, and Command N typically opens a new window or tab in most applications, making them unrelated to the task of taking a screenshot of an open window.