Which of the following is NOT a type of cloud deployment model?

The choice of "shared" is not recognized as a distinct cloud deployment model within the standard framework of cloud computing. The primary cloud deployment models include private, public, and hybrid.

In a private deployment model, the cloud infrastructure is exclusively used by a single organization, providing a higher level of control and privacy for sensitive data. A public cloud, on the other hand, is made available to multiple organizations over the internet, allowing users to access shared resources managed by a third-party service provider. Meanwhile, a hybrid model combines both private and public clouds, enabling data and applications to be shared between them, thus allowing for greater flexibility and optimization of existing infrastructure.

The concept of "shared" may exist in cloud service settings, typically referring to shared resources within infrastructure or services, but it does not constitute a standalone deployment model like the others. Therefore, it being excluded from the list of recognized cloud deployment models is consistent with established definitions in the field of cloud computing.