Which sentence describes the right thing to do when the computer doesn’t respond?

Sharon was working on her computer when it suddenly stopped responding. She checked the power supply of the computer. It was fine. But the computer still did not respond. (1. Her little brother came in her room and suggested that she switch off the power supply to the computer.) (2. Sharon’s mom heard this conversation and told Sharon to press the Num Lock key multiple times.) (3. Her dad thought she should press the Ctrl, Alt, and Delete keys simultaneously and reboot the computer.) (4. When she called a friend, he said that she should just press any mouse key multiple times.)