Final answer:
The commands to lock a computer are Ctrl + Alt + Delete and Win + L.
Step-by-step explanation:
The commands to lock a computer are:
- Ctrl + Alt + Delete - This is a commonly used command on Windows computers to open the security options, which includes the ability to lock the computer.
- Win + L - This command is specific to Windows and is a quick way to lock the computer.
Neither Ctrl + Shift + Esc nor Alt + F4 are commands to lock a computer.