What do disks, CDs, DVDs, and portable hard drives provide?

The correct response highlights that disks, CDs, DVDs, and portable hard drives serve as secondary portable storage for data files. This classification is important because these media types are designed to store files, documents, photos, music, and other data that users need to transfer between computers or access at different locations. They are particularly useful for individuals who need to keep backups or maintain data accessibility without relying on primary storage options like the internal hard drive of a computer.

In contrast, while main storage for operating systems typically involves internal drives and SSDs that are integrated into the computer itself, secondary storage options such as portable drives and optical media are used to enhance storage capabilities or facilitate data transfer. Permanent storage of programs is more related to internal drives or system installations, as these are intended for long-term use and integration with the operating system. Cloud backup services refer to online solutions for storing data remotely, which is distinct from the physical media mentioned in the question. Hence, the role of disks, CDs, DVDs, and portable hard drives is aptly characterized as providing secondary portable storage for data files.