单项选择题 The system administrator at a university has many stand-alone machines and wants to consolidate them， minimizing the amount of time to upgrade all of the operating systems. Which of the following solutions supports the requirement？（）

单项选择题 An IT manager needs to deploy multiple applications simultaneously. Which virtualization technology will reduce the number of operating system maintenance tasks？（）

单项选择题 An IT director is eager to adopt POWER7 servers because of their relative performance ratings and energy efficiency， but is concerned about migrating applications which require AIX 5.3. Which of the following will address his concern？（）