How do you troubleshoot a Windows STOP error?

Your computer has recently been randomly suffering from the dreaded “blue screen of death” Windows STOP error page. What should you do to troubleshoot the problem?

A) Note of the STOP error file and error message and search the Internet for some recommendations

B) Perform a hardware diagnostic of the computer

C) If changes have recently been made to the hardware or software configuration of the computer, restore a previous configuration to see if the error stops occurring

D) All of the above

E) None of the above