Today You Turned on Your Computer After Being on Vacation

Multiple Choice

Today you turned on your computer after being on vacation for a week. You see spinning white dots on a black screen. You decide that an update might be installing, so you allow the computer to work for approximately 20 minutes. After 20 minutes, you turn off your computer and then restart it, and it fails two more times.  
What tool should you use first to help repair your computer?

A) Use BIOS to see if the hard drive is available.
B) Use Safe Mode to boot.
C) Use Startup Repair.
D) Run sfc /scannow for Windows RE command prompt.