Which cloud infrastructure comprises two or more cloud deployment models, bound by standardized or proprietary technology that enables data and application portability?

The correct answer is the hybrid cloud infrastructure. A hybrid cloud combines both public and private cloud deployment models, allowing organizations the flexibility to leverage the benefits of each. This environment enables data and application portability between the two models, ensuring that organizations can keep sensitive workloads in a private cloud while taking advantage of the scalability and resources of a public cloud for less sensitive operations.

The use of standardized or proprietary technologies in a hybrid setup is crucial because it facilitates seamless integration and communication between the different environments. This flexibility is particularly important for businesses seeking to optimize their IT strategy, allowing them to respond to varying workloads and security needs dynamically.

Other options represent distinct cloud deployment models. The private cloud isolates resources for a single organization, while the public cloud offers shared resources to multiple users. Community clouds serve a specific group with shared concerns but do not inherently allow for the kind of integration and portability that defines a hybrid model. Hence, the hybrid cloud is uniquely positioned to blend these different elements effectively.