正解:C
The ext4 (fourth extended filesystem) is a journaling file system for Linux. It is widely used in many Linux distributions due to its performance, robustness, and advanced features like large file and volume support.
* macOS: Uses filesystems like HFS+ or APFS.
* iOS: Uses APFS (Apple File System).
* Linux: Uses ext4 among other filesystems like ext3, XFS, Btrfs, etc.
* Windows: Uses NTFS, FAT32, and exFAT, not ext4.
Reference: CompTIA A+ Exam Objectives [220-1102] - 1.1: Compare and contrast common operating system types and their purposes.