Which of the following observations would an IS auditor consider the GREATEST risk when conducting an audit of a virtual server farm for potential software vulnerabilities?

Which of the following observations would an IS auditor consider the GREATEST risk when conducting an audit of a virtual server farm for potential software vulnerabilities?
A . The hypervisor is updated quarterly.
B . Guest operating systems are updated monthly.
C . Antivirus software has been implemented on the guest operating system only.
D . A variety of guest operating systems operate on one virtual server.

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Answer: C