Explanation
A reservation will not guarantee auto-scaling is available because it involves the allocation of additional resources beyond what a cloud customer already has provisioned. Reservations will guarantee minimal resources are available to start virtual machines, run applications, and perform normal business operations.

Explanation
With SaaS, the application is a shared responsibility between the cloud provider and cloud customer. Although the cloud provider is responsible for deploying, maintaining, and securing the application, the cloud customer does carry some responsibility for the configuration of users and options. Regardless of the cloud service category used, the physical environment is always the sole responsibility of the cloud provider. With all cloud service categories, the data and governance are always the sole responsibility of the cloud customer.

GitHub is an application for code collaboration, including versioning and branching of code trees.
It is not used for applying or maintaining system configurations.

Explanation/Reference:
Explanation:
Within a SaaS implementation, the cloud customer licenses the use of the software from the cloud provider because SaaS delivers a fully functional application to the customer. With SaaS, the cloud provider is responsible for the entire software application and any necessary infrastructure to develop, run, and maintain it. The purchasing, development, and maintenance are fully the responsibility of the cloud provider.