The answer to this question is D. There are times when you would open your computer, but you will get this error message. Those who do not know anything about computers may not know precisely what is wrong. They can search for possible reasons, but it is not likely that they will find the actual cause. When you see this error message, this means that there is something wrong with your CMOS settings.
This means that some of your details in your BIOS are not correct. You can try to troubleshoot by changing the settings, but if you are afraid that you are going to make the condition worse, hire the right professional to fix this issue.