Which custom configuration is most likely to include a raid array?

Solution:

The installation wizards in most of the commercial Linux distributions provide an option to create a custom disk layout, specifying which the RAID arrays can be created and the root. Additional RAID arrays can be configured by using the mdadm

It is known as (Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement.

Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the required level of redundancy and performance. It provide protection against unrecoverable sector read errors, as well as against failures of whole physical drives.

This is the required solution.