Operating System (OS) Quizzes Disk Operating System (DOS)

Question:
Which command is executed before the others when a computer is first turned on?

Option A):
Device=c:\dos\himem.sys
Option B):
Prompt=$p$g
Option C):
Device=c:\emm386.exe
Option D):
Patch c:\dos

Correct Answer is Option A):
Device=c:\dos\himem.sys