Which of the following description of Flink barrier is wrong?

Which of the following description of Flink barrier is wrong?
A . The barrier is periodically inserted into the data stream and flows as part of the data stream
B. barrier is the core of Flink snapshot
C. A barrier separates the data of this cycle snapshot from the data of the next cycle snapshot
D. When the barrier is inserted, the data flow will be temporarily blocked

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Answer: D