The software-defined data center is often considered the next step in the evolution of converged
infrastructure and cloud computing.
What is the definition of a software-defined data center?

A.
a federated data center solution integrated with orchestration tools to provide cloud automation

B.
an open-environment data center delivered by automation and agility across the network

C.
a data center built on a programmable network aligned to business applications

D.
a data center where the infrastructure is virtualized and IT is delivered as a service

Explanation:
https://blogs.vmware.com/vmware/2012/08/the-software-defined-datacenter-meetsvmworld.html(second para)