To answer this question, we need to understand the concept of RAID (Redundant Array of Independent Disks) and data protection levels associated with it.
RAID is a technology that combines multiple physical disk drives into a single logical unit to improve performance, reliability, and data protection. Different RAID levels provide different levels of data protection, depending on the redundancy and fault tolerance mechanisms they employ.
Now, let's go through each option to understand why it is correct or incorrect:
Option A) RAID 1 and Fallback - This option is correct because RAID 1, also known as mirroring, provides the highest level of data protection. In RAID 1, data is mirrored across multiple drives, meaning that each drive contains an exact copy of the data. This redundancy ensures that even if one drive fails, the data can still be accessed from the other drive. Fallback refers to the ability to switch to a backup or redundant system in case of failure, further enhancing data protection.
Option B) RAID 5 and Fallback - This option is incorrect because RAID 5 does not provide the maximum level of data protection. RAID 5 uses striping with parity, distributing data and parity across multiple drives. While it offers some fault tolerance by allowing the system to continue functioning even if one drive fails, it does not provide the same level of redundancy as RAID 1.
Option C) RAID 5 and No Fallback - This option is incorrect for the same reasons mentioned above. RAID 5 without fallback does not provide the maximum level of data protection.
Option D) RAID 1 and No Fallback - This option is incorrect because while RAID 1 offers a high level of data protection, not having fallback limits the ability to switch to a backup or redundant system in case of failure, reducing the overall level of data protection.
Therefore, the correct answer is A) RAID 1 and Fallback. This option provides the maximum level of data protection by combining the redundancy of RAID 1 with the ability to switch to a backup or redundant system in case of failure.