某云计算服务商向电信运营商提供计算能力、存储空间及相应的运营管理服务。按照云计算服务提供的资源层次，该服务类型属于 （ ） 。
- A.IaaS
- B.CaaS
- C.PaaS
- D.SaaS
正确答案及解析
正确答案
解析
IaaS（基础设施即服务），向用户提供计算机能力、存储空间等基础设施方面的服务。这种服务模式需要较大的基础设施投入和长期运营管理经验，但IaaS服务单纯出租资源，盈利能力有限。
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