CompTIA A+ Core 2 Question D-20

A technician installed a second hard drive in a computer. Upon restart, a message appears stating. “primary drive 0 not found. Press F1 to continue.” Which of the following should the technician check FIRST?

A. That NTLDR and boot.ini are not missing
B. Proper drive installation (e.g. cables/jumpers)
C. If computer can boot into safe mode
D. If the BIOS boot settings are correct