Which cloud deployment model uses two or more private or public clouds for a single...

The correct answer is A. hybrid cloud.

A hybrid cloud is a cloud deployment model that combines two or more distinct cloud infrastructures, typically private cloud, public cloud, or a combination of both, that remain separate environments but are connected by technology that enables data and application portability. This definition directly matches the wording of the question, which describes a single organization using multiple clouds connected together.

In Cisco data center and cloud architecture discussions, hybrid cloud is commonly used when an organization wants to keep some workloads on-premises or in a private cloud while extending other workloads to a public cloud provider for flexibility, scalability, disaster recovery, or cost optimization. The important point is that the clouds are integrated and interoperable, not isolated.

The other options do not match. A private cloud is dedicated to one organization but does not inherently combine multiple clouds. A public cloud is owned and operated by a cloud provider for general use. A community cloud is shared by organizations with common requirements. Therefore, the only model that specifically describes connecting two or more clouds for one organization is hybrid cloud.