A Community Cloud is best defined as:

A Community Cloud is best defined as a shared infrastructure among organizations with similar needs. This model allows multiple organizations to collaborate and share resources while maintaining a certain level of control over their data and applications. Community Clouds provide the benefits of cloud computing, such as scalability and flexibility, while enabling organizations with similar regulatory, compliance, or mission requirements to work together.

This infrastructure is particularly advantageous for public sector organizations, non-profits, or institutions requiring collaborative environments, as it fosters resource sharing and reduces costs while ensuring that common concerns and goals are addressed collectively. The shared nature of the infrastructure involves pooling resources, leading to better usage efficiencies and potentially lower costs for the organizations involved.

In contrast, the other options reference different types of cloud environments: a private cloud pertains to a single organization’s dedicated infrastructure, a public cloud is accessible to the general public and typically offers services to a wide audience, and an isolated network focuses narrowly on security without the community aspect that characterizes a Community Cloud.