How can Janet open Notifications on her iMac?

To open Notifications on her iMac, Janet can simply click the Notifications icon located in the menu bar. This icon is typically represented by three stacked lines or a bell symbol, depending on the macOS version. By clicking this icon, she can easily access all alerts and notifications, such as messages, app updates, and system alerts. This method is the most straightforward and user-friendly way to manage notifications, as it provides immediate access without needing to navigate through menus or use keyboard shortcuts.

Other options suggest methods that are not related to accessing Notifications. The Open command and the View menu are typically associated with managing files or applications rather than accessing system notifications. Similarly, the Command-Shift keyboard command does not correspond to a known shortcut for opening Notifications. Choosing "About this Mac" from the Apple Menu leads away from notifications and provides system information instead, which does not serve the purpose of opening the notification center.