Which of the following RAID levels provides exceptional redundancy and no write penalties?

RAID 1 provides redundancy through mirroring but can have a slight write penalty as data must be written to two disks, and it does not offer the exceptional redundancy of RAID 10.

RAID 3 (byte-level striping with dedicated parity) provides redundancy but suffers from significant write penalties because every write requires updating the single parity disk.

RAID 6 (striping with dual parity) provides excellent redundancy by tolerating two drive failures, but it incurs a significant write penalty due to the complex calculation and writing of two parity blocks for every write operation.

RAID 10 (RAID 1+0) combines mirroring (RAID 1) for redundancy and striping (RAID 0) for performance. Data is mirrored in pairs, and these mirrored pairs are then striped, providing both high data protection by tolerating multiple drive failures and excellent write performance because writes occur simultaneously to the mirrored pairs, effectively eliminating a write penalty often associated with parity calculations.