Where do you configure sudo permissions?

The correct choice is indeed the configuration of sudo permissions within the /etc/sudoers file using the visudo command. This file is critical for defining which users have permissions to execute commands as superuser or other users.

Using visudo is particularly significant because it provides a safe way to edit the sudoers file. When you use visudo, it checks the syntax of the file upon saving to prevent any misconfigurations that could lock out all sudo access, ensuring the stability of your system. Therefore, any changes made through visudo are validated, minimizing the risk of errors that could arise from manual edits.

The other options do not reflect standard practices for configuring sudo permissions. For instance, while some might think that /etc/sudo.conf might be involved, this file does not handle user permissions but rather other configuration directives. Similarly, /usr/sudoers and /opt/sudoers.file are not actual files used in the sudo configuration process. The correct approach must be adhered to foster security and functionality within a Unix-like operating system, emphasizing the role of the visudo command for safe editing.