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RAID level 2 refers to?

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RAID level 2 refers to?

(a) Disk arrays with striping at the level of blocks

(b) Disk mirroring with block striping

(c) Memory style error correcting code

(d) Block interleaved distributed parity

The question was asked in an interview for job.

My question is from RAID topic in chapter Storage and File Structure of RDBMS

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The correct choice is (c) Memory style error correcting code

The explanation: RAID level 2 refers to Memory style error correcting code. Memory systems have long parity bits for error detection and correction.

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