Which key combination allows Windows users to view all running processes?

The key combination that allows Windows users to view all running processes is Ctrl-Shift-Esc. This combination opens the Task Manager directly, where users can see a list of all running applications and processes.

While the combination Ctrl-Alt-Delete does present several options, one of which is Task Manager, it is not as direct as Ctrl-Shift-Esc, which brings up the Task Manager immediately. This makes Ctrl-Shift-Esc more efficient for users who want to manage their processes quickly.

Alt-F4 is used to close the currently focused window and does not provide any information about running processes. Similarly, Ctrl-Tab is commonly used to switch between open tabs or windows in applications and does not relate to viewing processes within the system.

In summary, the combination that most directly allows users to access and view all running processes is Ctrl-Shift-Esc, making it the correct answer in this context.