GaussDB is based on the Shared-Nothing architecture. Which of the following statements about the advantages of this architecture is wrong?

GaussDB is based on the Shared-Nothing architecture. Which of the following statements about the advantages of this architecture is wrong?
A . Data is fully shared between nodes
B . Adding nodes to achieve performance expansion
C . Parallel processing mechanism, easy to expand
D . Internal processing automation and parallelization

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Answer: A