Final answer:
The correct answer is b) 1. RAID level 1 refers to disk mirroring, which involves duplicating data across two or more disks to provide redundancy in case one disk fails.
Step-by-step explanation:
The correct answer is b) 1.
RAID stands for Redundant Array of Independent Disks and refers to a method of combining multiple physical disks into a single logical unit to improve performance and fault tolerance. RAID level 1, also known as disk mirroring, involves duplicating data across two or more disks. This means that every piece of data is stored on multiple disks, providing redundancy in case one disk fails.
For example, if you have two disks in a RAID 1 configuration and one disk fails, you can still access all your data from the remaining disk. RAID 1 provides good data redundancy and read performance, but it is less efficient in terms of disk space usage compared to other RAID levels.