Which of the following storage types is BEST suited for data immutability?

DAS (Direct Attached Storage) is storage directly connected to a server and, while flexible, does not inherently provide immutability features.

SAN (Storage Area Network) provides block-level access to storage, but it is generally designed for mutable data and does not intrinsically enforce immutability.

CAS (Content Addressed Storage) is specifically designed for fixed-content data, where data is stored based on a cryptographic hash of its content. This design inherently ensures immutability, as any change to the data would alter its hash, effectively creating new data rather than modifying the original.

NAS (Network Attached Storage) provides file-level access over a network and is typically used for mutable data, although some NAS solutions may offer features like snapshots or WORM (Write Once, Read Many) that provide limited immutability.