An Enterprise Has Purchased Two Sets of HUAWEI OceanStor 9000

An enterprise has purchased two sets of HUAWEI OceanStor 9000 devices. To ensure the security of the data, one set provides storage for the production site and the other set is on the disaster recovery site to provide data redundancy. If the two Huawei Oceanstor 9000 storage system are to establish remote replication, which of the following is wrong?

A) Recovery strategy supports both manual and automatic methods
B) synchronization rates are high, medium and low third gear
C) The type of synchronization is manual, the timing is started after the synchronization starts, and the timing is delayed after the synchronization is completed
D) When the synchronization type is set to manual, there is no need to set the timing duration If the synchronization type is set to be either custom waiting when synchronization starts or when waiting for customization after synchronization, you need to set the timing duration