Which of the following statements is true?

a. In order to lease cloud-based IT resources, a cloud consumer’s up-front investment costs must increase when compared to the up-front costs required to purchase the same IT resources as part of an on-premise environment.
b. A required characteristic of on-premise environments is that they are resilient so as to provide high availability and reliability. This allows an on-premise SaaS product to be widely accessible by multiple cloud service consumers.
c. When leasing IT resources provided by a public cloud, cloud consumers are required to pay only for the amount of actual usage.
d. None of the above

Statement (c) is correct because cloud environments provide measured usage of IT resources and public clouds especially do so using a pay-per-use model.