Which of the following early examples of cloud computing was used for software engineering purposes in the form of web-based applications and required interoperability between different systems?

Which of the following early examples of cloud computing was used for software engineering purposes in the form of web-based applications and required interoperability between different systems?
A . Distributed Computing
B . Service-Oriented Architecture (SOA)
C . Virtual Private Networks (VPNs)
D . Desktop Virtualization

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Answer: B