What is unique about the QoS function within IBM DS8000 as compared to other IBM storage products?

What is unique about the QoS function within IBM DS8000 as compared to other IBM storage products?
A . The IBM DS8000 is the only IBM storage system offering QoS
B . IBM System z and Open/distributed volumes can use the same managed Performance Groups
C . It includes Transparent Cloud Tiering
D . I/O Priority Manager can be integrated with the IBM System z WLM

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Answer: B