A database administrator requests additional disk space for database scratch space. The administrator requires the space be protected from a disk failure and wants the space to have a good response…

A database administrator requests additional disk space for database scratch space. The administrator requires the space be protected from a disk failure and wants the space to have a good response time. The database will be writing 70 percent of the time to this file system and reading 30 percent of the time. Which RAID level most efficiently satisfies these requirements?