Despite the anti-virus protection program installed on its computers, SmartTech has received many complaints from consumers that their computers had become infected with viruses. In order to reduce the number of its computers vulnerable to viruses, the CEO of SmartTech Corp. has had the company's engineers install three different virus-blocking programs on each computer before shipping them to consumers. Nevertheless, customer reports of computer viruses have risen since the institution of this initiative.

Which of the following, if true, most helps to explain why acting on the CEO's plan failed to achieve her goal?

A:The installation of the three anti-virus programs has led to increased labor costs, taking away resources from other company departments.

B:When more than one anti-virus program is installed on a machine, the programs can become less effective.

C:Many consumers have found that it is more difficult to use a computer with three anti-virus programs than with one.

D:Corporations that are already vulnerable to hackers often use SmartTech's computers but have stopped doing so since the increased viruses.

E:SmartTech has lost approximately 25 percent of its clients as a result of its computers' vulnerability to viruses, though it regained a third of these with its recovery efforts.