How does the Near-Zero Downtime method minimize the downtime of the productive SAP system during migration?

How does the Near-Zero Downtime method minimize the downtime of the productive SAP system during migration?
A . A clone of the productive system is used.
B . The data from previous years is archived.
C . Optimized data compression is used to minimize the data volume.
D . SQL database commands are used to accelerate the migration

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Answer: A