What is the recommended storage policy to ensure cross-site and local protection, using storage as efficiently as possible?

A planned VxRail Stretched Cluster will have four All-Flash nodes at each site

What is the recommended storage policy to ensure cross-site and local protection, using storage as efficiently as possible?
A . Site disaster tolerance – None – keep data on Preferred (stretched cluster) Failures to tolerate – 1 failure – RAID-5 (Erasure Coding)
B . Site disaster tolerance – Dual site mirroring (stretched cluster) Failures to tolerate – 1 failure – RAID-5 (Erasure Coding)
C . Site disaster tolerance – Dual site mirroring (stretched cluster) Failures to tolerate – 1 failure – RAID-1 (Mirroring)
D . Site disaster tolerance – Dual site mirroring (stretched cluster) Failures to tolerate – no data redundancy

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Answer: B