The marketing group in your organization is planning a new campaign that will involve extensive use of online videos. Development of these videos will consume a significant amount of storage on the Windows server that you manage. To meet their needs, you plan to implement a new storage pool on the server using the following parameters: Three-way mirroring will be used for redundancy. Write-back caching will be used to optimize performance. Tiering will be used to ensure that the most important files are stored on the fastest storage devices. What is the minimum number of SSD drives that should be used in the pool