The correct answer is: A. Using useradd.
useradd is a command-line utility for adding users to a Linux system. It can be used to create a new user account, set the user’s home directory, and assign the user a password.
To add a new user using useradd, you can use the following command:
useradd -m -s /bin/bash amit
This command will create a new user account named “amit” with a home directory in /home/amit and a shell of /bin/bash.
You can also use the useradd command to set other attributes for the user account, such as the user’s full name, the user’s group, and the user’s login shell. For more information on the useradd command, you can consult the useradd man page.
The other options are incorrect because they are not valid ways to add a new user to a Linux system. linuxconf is a graphical user interface for configuring Linux systems, but it does not have a feature for adding new users.