A. Modifier
B. Function
C. Role
D. None of these
🧠 Explanation:
- Ctrl, Shift, and Alt are known as **modifier keys** on a keyboard.
- They do not perform actions by themselves but modify the function of other keys when used together.
- For example, pressing Ctrl + C triggers the "Copy" command, while Shift changes lowercase letters to uppercase.
- Modifier keys are essential for executing keyboard shortcuts and enhancing user productivity.