[单选题]Cloud-computing providers offer their “services” according to different models, which happen to form a stack（ ）, platform as a service (Paas), software as a service (SaaS).
Ahardware as a service (Haas)
Bnetwork as a service (NaaS)
Cinfrastructure as a service (IaaS)
Ddata as a service (DaaS)
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