What is facilitated by the Topology and Orchestration Specification for Cloud Applications (TOSCA) standard?

What is facilitated by the Topology and Orchestration Specification for Cloud Applications (TOSCA) standard?
A . Packaging and distribution of virtual appliances across clouds
B . Preparation of functional interfaces for service orchestration
C . Portable deployment of services to any compliant cloud
D . Communication between applications running on a variety of platforms

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Answer: C