Which of the following observations should be of GREATEST concern to an IS auditor reviewing a hosted virtualized environment where each guest operating system (OS) is running a production application? 

Answer options:

A. All virtual machines are launching an application backup job at the same time.
B. There are file shares between the host OS and the guest OS.
C. Access to virtualization utilities and tools in the host is not restricted.
D. The test environment of the applications is in a separate guest OS.

B