omputer Operating system software has
become increasingly standardized. But
when a large business with multiple,
linked computer systems uses identical
operating system software on all of its
computers, a computer vandal who gains access
to one computer automatically has access to the
data on all the computers. Using a program
known as a “virus,” the vandal can then destroy
much of the data on all the computers. If such a
business introduced minor variations into its
operating system software, unauthorized access
to all the computers at the same time could be
virtually eliminated. Furthermore, variations in
operating system software can be created
without any loss of computer compatibility to
the business. Therefore, it is advisable for
businesses to implement such variations.

Which one of the following, if true,
supports the conclusion in the passage?
�� Standardization of computer operating
systems software has increased
computer compatibility among different
businesses.
�� Correcting any damage resulting from
an invasion by a computer virus
program is more expensive than
preventing the damage.
�� It is not costly for a business to
maintain incompatible computer
operating systems.
�� There are other kinds of destructive
computer programs that do not depend
on inter-computer links.
�� Not all computers need to share data
among their internal computer systems.