Of the three classes of intruders into computer systems and ...

[pragya sharda]

Of the three classes of intruders into computer systems and networks, the
  clandestine user is typically:
 
  A. an insider to the organization
 
  B. an outsider to the organization
 
  C. either an insider or an outsider to the organization
 
  D. none of the above

Question 2

Why do some installations require you to reboot your computer?
 
  What will be an ideal response?

[potomatos]

Answer to Question 1

C

Answer to Question 2

They set variables and/or make changes to your registry. To take full effect, you need to reboot your computer.