According to EMC best practices, how many metadata volumes for a VPLEX Metro configuration are required on each cluster?

According to EMC best practices, how many metadata volumes for a VPLEX Metro configuration are required on each cluster?
A .  4 Metadata volumes and 4 Metadata Backup volumes
B .  2 Metadata volumes and 1 Metadata Backup volume
C .  2 Metadata volumes and 2 Metadata Backup volumes
D .  4 Metadata Volumes and no Metadata Backup volumes

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Answer: C