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Which option is the most cost effective strategy and fulfils the constraints?

Company.com needs to implement a high availability model for its mission critical datA. Cost is important, but the solution must meet the following criteria:

1) Data can never be offline for more than 10 minutes, even after a failure

2) Databases must be on line during backups.

3) The company is using RAID 5 and must guard against double disk failure

Which option is the most cost effective strategy and fulfils the constraints?