The correct answer is D. All of the mentioned.
Git is a distributed version control system, while GitHub is a web-based hosting service for version control using Git. It is mostly used for computer code. It offers all of the distributed version control and source code management (SCM) functionality of Git as well as adding its own features. It provides access control and several collaboration features such as bug tracking, feature requests, task management, continuous integration, and wikis for every project.
You can use Git without GitHub, but it is not as convenient. GitHub provides a web-based interface for managing your Git repositories, as well as a number of features that make it easier to collaborate with others. For example, GitHub allows you to create branches and pull requests, which make it easy to propose and review changes to a project.
You can also access other people’s repositories on GitHub without having to create your own account. This is useful if you want to contribute to an open source project or if you want to learn from someone else’s code.
However, it is not necessary to use GitHub to use Git. You can download and install Git on your own computer and use it to manage your own repositories. This is useful if you want to work on projects that are not public or if you want to have more control over your code.