Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

（73）处填（）。

A．system

B．infrastructure

C．hardware

D．link