Which definition of permissions in Linux is true?

Rules that allow or deny network traffic describe firewall rules (such as iptables or nftables rules), not file system permissions.

A table maintenance program describes utilities like fsck for filesystem checks or mysqlcheck for database maintenance, which are unrelated to permissions.

A written affidavit or agreement describes an End User License Agreement (EULA) or acceptable use policy - a legal concept, not a technical Linux permission.

In Linux, permissions are attributes that define ownership (user and group) and access control (read, write, execute) for files, directories, and other objects. They are represented by the rwx permission bits and are enforced by the kernel. Commands like chmod and chown are used to modify these attributes.