Cloud-computing providers offer their“services”according to differentmodels,which happen to form a stack（ ）,platform as a service(Paas),software as a service(SaaS).
A.hardware as
A.service(Haas)
B.network as
A.service(Naas)
C.infrastructure as
Aservice(IaaS)
Bdat
Cas
Dservice(DaaS)
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