Which of the following descriptions about Huawei storage (such as Huawei OceanStor hybrid flash) snapshots is wrong?

Which of the following descriptions about Huawei storage (such as Huawei OceanStor hybrid flash) snapshots is wrong?
A . Snapshots can be generated instantly, quickly obtaining a consistent copy of the original LUN
B . After the snapshot LUN is mapped to the host, data can be read and written
C . When the snapshot is inactive, the data I/O write process is the same as when no snapshot is created.
D . After creating a snapshot, during the redirection write process, overwriting does not require reallocation of space

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Answer: D