Which layer of the logical stack includes code and message queues?

The infrastructure layer contains the physical and virtual compute, storage, and network resources - not application-level components like message queues.

The metastructure layer provides the interfacing protocols between infrastructure and higher layers, not application services or code.

The infostructure layer covers data assets, data governance, and information management - not application code or messaging components.

In the CSA cloud computing logical model, the applistructure layer is the topmost layer and contains the application logic and services deployed in the cloud, such as Platform-as-a-Service components including message queues, notification services, application code, and other middleware. These components are what developers use to build cloud-native applications. Security in this layer requires attention to secure coding practices, API security, and proper configuration of messaging services.