Keyboard

The most commonly used keyboard layout in English-speaking countries is the QWERTY layout, named after the first six letters on the top row of the keyboard.

Step 1: Understand the Undo function.
The Undo command reverses the last action performed by the user.
Step 2: Analyze the options.
Ctrl + C is used for Copy.
Ctrl + V is used for Paste.
Ctrl + X is used for Cut.
Ctrl + Z is used to Undo the last action.
Step 3: Conclusion.
Hence, the correct shortcut for Undo is Ctrl + Z.