AT&T Information Practice Test

The main idea behind RAID is to protect data by using multiple disks to add redundancy and fault tolerance. By duplicating data or distributing parity information across drives, RAID lets the system reconstruct lost data if a drive fails, keeping data available and safe. That focus on preventing data loss is what makes data redundancy the correct answer. RAID configurations can also influence performance in some setups, but they’re designed primarily to safeguard data rather than reduce disk noise, cut power use, or speed up the CPU.