What command initializes an empty Git repository?

To initialize an empty Git repository, the command used is "git init." This command creates a new subdirectory named ".git" in the current directory, which contains all the necessary metadata for the repository. It essentially sets up the structure that Git needs to track changes, manage versions, and facilitate collaboration on projects.

When "git init" is executed, it prepares the working directory for version control, allowing users to start adding files to the repository and perform operations such as commits, branching, and merging. This command is fundamental when starting a new project or converting an existing directory into a Git repository.

The other options do not represent valid commands used to initiate a Git repository. "git start" and "git create" are not recognized Git commands, while "git config" is used to set up user-specific configurations such as username and email but does not initialize a repository. Thus, "git init" is the correct command for this task.