What is the purpose of the NVMe NVRAM drives in a Dell EMC PowerStore 9000 array?

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What is the purpose of the NVMe NVRAM drives in a Dell EMC PowerStore 9000 array?
A . Read cache and vaulting
B . Read cache and base OS
C . Write cache and base OS
D . Write cache and vaulting

Answer: D

Explanation:

Reference: https://www.delltechnologies.com/en-us/collaterals/unauth/white-papers/products/storage/h18149- dell-emc-powerstore-platform-introduction.pdf (12)