Which Huawei Oceanstro V3 Storage System Prefetch Strategy Is Correct

Which Huawei oceanstro V3 storage system prefetch strategy is correct?

A) Intelligent prefetching for a single data stream read application, or cannot determine the sequence of read applications
B) variable prefetching suitable for fixed-size sequential read applications, such as multi-user liunx media on demand, users use the same code stream
C) Fixed prefetch for database applications
D) Not prefetched for multi-user multimedia on demand