Differentiate between Infrastructure as a Service, Platform as a Service and Software as a Service.

1) Differentiate between Infrastructure as a Service, Platform as a Service and Software as a Service.
2) The authors claim: Developers with innovative ideas for new Internet services no longer require the large capital outlays in hardware to deploy their service or the
human expense to operate it. Discuss the statement, pointing out whether and why you agree or disagree with the proposition.
3) Discuss the cloud computing economics, i.e. why cloud computing is an economic choice for companies of any size.