题目内容
(请给出正确答案)
[主观题]
Cloud-computing providers offer their “services” according to different models, which happ
en 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 a service (IaaS)
D.data as a service (DaaS)
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