单项选择题

The IBM XIV Storage System is designed to be cost-efficient in all aspects, while deliveringoutstanding and consistent performance. Which of these features is currently UNAVAILABLE onthe XIV system?（）

A.single-tier architecture supports all kinds of storage in one environment and makes scaling easy
B.built-in thin-provisioning allows the acquisition and installation of additional capacity to bedelayed until needed.
C.innovative use of solid state disk drives offers excellent capacity-for-cost value while meetingenterprise performance standards
D.use of off-the-shelf components makes customized hardware unnecessary and makes itpossible to integrate state-of-the-art hardware assoon as it becomes available.

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