You are the Network Administrator for a college. You watch a large number of people (some not even students) going in and out of areas with campus computers (libraries, computer labs, etc.). You have had a problem with laptops being stolen. What is the most cost effective method to prevent this? 

Answer options:

A. Smart card access to all areas with computers.
B. Use laptop locks.
C. Video surveillance on all areas with computers.
D. Appoint a security guard.

B