Which dual-level RAID configuration is combined to configure RAID 10 on a single array?

RAID 10, also known as RAID 1+0, is a combination of two RAID levels: RAID 1 and RAID 0. In this configuration, data is first mirrored (which is the RAID 1 aspect) and then those mirrors are striped (which is the RAID 0 aspect). This setup allows for both redundancy and improved performance.

The dual-level configuration mentioned is essential because it combines the benefits of mirroring, which protects against a single drive failure, with striping, which enhances read and write performance. By stripping data across multiple mirrored sets, RAID 10 achieves high availability and increased performance compared to other RAID configurations.

In the context of this question, the phrasing "striped and mirrored" accurately describes the process of first creating mirror sets (RAID 1) and then applying striping (RAID 0) on those sets to form the final RAID 10 array. This is why this answer is correct—it reflects the accurate structure and functionality of RAID 10.