Final answer:
Ext4 is the file system with journaling capability among the options given. Ext2 does not have journaling, and Isofs, used for optical discs, is usually read-only and also does not support journaling.
Step-by-step explanation:
Out of the file systems listed, Ext4 has the journaling capability. Journaling is a feature that helps protect the integrity of the file system by keeping track of changes that will be made in a journal before they are actually applied. This helps in recovering from crashes or power failures, ensuring that the file system can be brought back to a consistent state without losing data or corrupting files.
Ext2, the second extended file system, is an older file system without journaling capability. Instead, it uses traditional Unix file system semantics. It was the default file system for several Linux distributions until it was superseded by more advanced journaling file systems.
Isofs is a file system for ISO image files and it's commonly used for optical disc media. It doesn't have journaling capability since it's typically read-only and used for distribution of software and data that doesn't change, like Linux installation CDs or DVDs.