题目选项分析

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?

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