The following description of high performance technology in HyperMetro, which is correct? (Multiple Choice)

The following description of high performance technology in HyperMetro, which is correct? (Multiple Choice)
A . Reduce copy is quick recognition to the data copy source end through the hardware chip and find out the zero data; in the process of copy, all zero data will be specially identified, only a small special page is transmitted to the opposite end, no longer full transmission.
B . In optimal array mode, I/O is only load-balanced distributed on the optimal array path set by the user when the host service is accessed. With this mode configured, arbiter server mode can’t be configured.
C . HyperMetro is protocol-level optimized for data transfer between arrays with the FastWrite feature and uses the First Burst Enabled feature of the SCSI protocol to reduce the number of link transmissions of write data to half.
D . HyperMetro does the concurrent mutex to LBA interval and distribution range-locks of host I/O access with host I/O granularity to achieve the goal of two-way real-time synchronization, this solutin can save unnecessary data transmission between arrays curtain, and effectively reduce the number of data transmission.

Answer: ACD