The correct answer is Authentication.
Authentication is the process of verifying the identity of a user or system. It is the first step in ensuring that only authorized users have access to a computer system.
After the computer is booted and the GUI is loaded, the next step is to authenticate the user. This is usually done by requiring the user to enter a username and password. Once the user is authenticated, they are granted access to the system.
The other options are not correct because they are not the first program that runs after the computer is booted and the GUI is loaded.
- Desktop Manager is a program that provides a graphical user interface (GUI) for the user. It allows the user to interact with the computer by clicking on icons and menus.
- File Manager is a program that allows the user to manage files on the computer. It allows the user to create, delete, and modify files.
- Windows Explorer is a file manager that is included with the Windows operating system. It allows the user to view and manage files and folders on the computer.
Authentication is the first step in ensuring that only authorized users have access to a computer system. It is a critical security measure that helps to protect systems from unauthorized access and use.