试题内容
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)
软题库参考答案：C（仅供参考）
软题库解析：正在加载....
