Which of the following description about the characteristics of Huawei Oceanstor V3 storage product is correct ?

Which of the following description about the characteristics of Huawei Oceanstor V3 storage product is correct ?
A . If you need to provide NAS function ,need to purchase additional NAS engine
B . If you need to take over other manufacturers storage arrays, and integrated into a unified resource pool, you need to purchase additional virtual gateway
C . Data can migrate between SSD and HDD in accordance with the strategy, performance and capacity have both
D . remote replication function can not be carried out between 6800 V3 across and 5300 V3

Answer: C