Which of the following file systems is designed by Sun Microsystems?

NTFS (New Technology File System) was designed and developed by Microsoft for use with Windows NT and subsequent Windows operating systems.

CIFS (Common Internet File System) is a network file-sharing protocol derived from SMB and was developed by Microsoft, not Sun Microsystems.

ext2 (Second Extended Filesystem) was created by Remy Card for the Linux kernel and has no association with Sun Microsystems.

ZFS was originally developed by Sun Microsystems engineers Matthew Ahrens and Jeff Bonwick and was first released as part of Solaris 10 in 2005. It introduced concepts such as copy-on-write transactions, built-in RAID-Z, end-to-end data checksumming, and storage pools, making it a landmark file system design. Sun Microsystems (later acquired by Oracle) holds the original design credit, distinguishing it from file systems created by Microsoft or the Linux community.