Which of the following understanding of the database cluster model is wrong?

Which of the following understanding of the database cluster model is wrong?
A . The two key points of the database cluster are:

has two or more database server groups,

can provide transparent services
B . Synchronize the database. After the database client sends a data update request, the node that accepts the request will copy and transfer the updated data to other nodes in the cluster while returning the results to the client.
C . Database cluster contains two models: synchronous cluster and asynchronous cluster
D . Asynchronous database, the node that accepts the request after the database client sends a data update request immediately returns the result to the client, and the updated data will be copied and transmitted to other nodes in the cluster at a certain time.

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Answer: B