What does 'sudo' stand for?

'Sudo' stands for "superuser do." This command allows a permitted user to execute a command as the superuser or another user, as specified by the security policy set in the system's '/etc/sudoers' file. The concept behind 'sudo' is rooted in the principle of least privilege, meaning users only receive elevated permissions when necessary, reducing the risk of accidental or malicious changes to the system. This is particularly important in multi-user environments or systems that require a higher level of security.

The other options do not accurately reflect the function or purpose of the command in the context of Unix-like operating systems. For example, "System User Do," "Secure User Do," and "Shell User Do" do not correspond to any recognized functionality associated with 'sudo.'