In synchronous remote replication, after a write request is issued from the server to the storage, how is the request sent?

In synchronous remote replication, after a write request is issued from the server to the storage, how is the request sent?
A . The request is sent in the sequence of the cache in the primary storage, disks in the primary storage, cache in the secondary storage and disks in the secondary storage.
B . The request is sent to the cache in the primary storage, and the cache sends it to the cache in the secondary storage.
C . The request is sent to the cache in the primary and secondary storage at the same time,
D . The request is sent to the cache in the primary storage, and then multi-time-segment caching is enabled to synchronize the request to the cache in the secondary storage.

Answer: C