Scenario: An administrator needs to upgrade the current XenServer environment to version 6.0. The current XenServer environment consists of 20 production virtual machines running mission-critical applications. When is it appropriate for the administrator to use the rolling pool upgrade wizard in this environment?
A. When upgrading from XenServer 5.5 or earlier
B. When high availability is enabled in the current environment
C. When virtual machines in the current environment need to keep running
D. When the current environment contains a SAN adapter for the StorageLink storage repository
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