What is the supported process to correct filesystem corruption which prevents a normal boot?

Booting into a maintenance shell in AIX provides a recovery environment where filesystems are not automatically mounted, allowing safe use of repair utilities. The volume group must be varied on manually to make the physical volumes accessible before fsck can be run against the corrupted filesystem. Running fsck prior to mounting is critical because executing it on an already-mounted filesystem can cause additional corruption rather than repairing it.

While this option also references a maintenance shell, the described sequence omits or misorders the required steps, making it an incomplete or incorrect recovery procedure compared to option A.

A restricted shell in AIX limits available commands and is not the correct boot environment for performing low-level filesystem repair operations such as varying on volume groups and running fsck.

Booting into a restricted shell does not provide the necessary access to AIX maintenance utilities required to vary on the rootvg and execute fsck for filesystem repair.