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The concept that automates the management of computing resources is Infrastructure as Code (IaC). IaC allows for the management and provisioning of computing infrastructure through machine-readable definition files, rather than physical hardware configuration or interactive configuration tools. This approach enables organizations to streamline their infrastructure management processes, reduce manual efforts, and improve consistency and repeatability in deploying resources.

With IaC, developers and operations teams can use coding languages and automation tools to define the desired state of infrastructure, enabling them to automatically create, modify, and maintain IT resources with greater speed and accuracy. It can also lead to better version control and auditing capabilities, as changes can be tracked in the same way as application code.

While the other concepts listed can relate to the management of computing resources in various ways, they do not focus specifically on automating the infrastructure management process as comprehensively as Infrastructure as Code does. For instance, cloud computing provides a delivery model for resources over the internet, but does not inherently automate resource management without IaC or other management frameworks. Microservice architecture pertains to how software applications are structured, and DevSecOps integrates security practices into the DevOps process, still relying on infrastructure management tools that could incorporate IaC.