An organization shares cloud resources with other specific organizations and costs are shared between the organizations. Which cloud deployment model is this?
Using the community cloud model shares resources between a specific community of users usually with some similarity. This model spreads costs between all the members of the community.
The Cloud Models on the CompTIA A+ objectives are:
Public Cloud: Services are provided over the internet and shared among multiple organizations.
Private Cloud: Cloud infrastructure is operated for a single organization.
Hybrid Cloud: A combination of public and private clouds, allowing data and applications to be shared between them.
Wikipedia
Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct active management by the user. Large clouds often have functions distributed over multiple locations, each of which is a data center. Cloud computing relies on sharing of resources to achieve coherence and typically uses a pay-as-you-go model, which can help in reducing capital expenses but may also lead to unexpected operating expenses for users.