The correct response, 'Full-disk encryption,' ensures that all the data stored on the physical disk is secured, including the system and boot partitions, providing a high level of protection if the disk is moved or stolen. This is in contrast to 'Volume encryption,' which might only secure data on certain logical volumes and not necessarily the whole disk. 'File-level encryption' only applies to individual files, allowing for specific files to be encrypted within a system. 'Container encryption' is not a standard term within the scope of this context and can cause confusion with other types of encryptions mentioned.