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When you run the command "Python" on a Linux system, it initiates the Python interpreter in an interactive mode. This is why the correct answer indicates that an interactive console will open for writing simple Python code.

In this console, users can type Python code directly and execute it line-by-line. This feature is particularly useful for testing code snippets, calculations, and learning Python programming in real-time. The interactive console creates a dynamic environment where developers can experiment with code without the need to create a separate script file.

The other options do not accurately describe what happens when you execute the command. For instance, while Python does have a library management system, running the command won’t automatically list installed libraries and modules. Additionally, Python doesn’t run in the background upon reboot simply by being invoked through this command; it requires explicit processes for that functionality. Lastly, invoking Python does not prompt users to open a specific Python code file, instead it provides a shell for immediate code execution.