In synchronous remote replication, about the process of the storage receiving I/O requests issued by the server, which of the following statements is correct?

In synchronous remote replication, about the process of the storage receiving I/O requests issued by the server, which of the following statements is correct?
A . First sent to the master Cache, and then sent to the master storage, and then synchronize to the slave Cache by the master storage
B . First sent to the master cache, and then sent by the master Cache to the slave Cache
C . Simultaneously sent to the master and slave cache.
D . First sent to the master Cache, in the master Cache enable the time slice technology and synchronize to the slave Cache.

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Answer: C