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).
A、
hardware as a service (Haas)
B、
network as a service (Naas)
C、
infrastructure as a service (IaaS)
D、
data as a service (DaaS)
【正确答案】
C
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