Which of the following is a characteristic of a RAID storage system?

A RAID (Redundant Array of Independent Disks) storage system is designed to increase data reliability and performance by using multiple disk drives. The characteristic of stacked platters for redundancy is central to how RAID operates. In a RAID setup, data can be distributed across several drives, which allows the system to continue functioning even if one or more drives fail, depending on the RAID level employed. This redundancy is achieved by storing copies of data or using techniques like striping and mirroring.

This feature is crucial for protecting data integrity and accessibility, especially in environments where data loss can have significant consequences, such as in servers or large data centers. Other options, while they may describe some attributes of storage systems, do not directly pertain to the fundamental principles of RAID. For instance, a single platter cannot leverage the advantages of redundancy, portable designs are typically not focused on redundancy, and built-in encryption is not a defining feature of RAID systems, although encryption can be implemented in conjunction with RAID for enhanced security.