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
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
