Which of the following statements are characteristics of pre-copy technology? (Multiple Choice)

Which of the following statements are characteristics of pre-copy technology? (Multiple Choice)
A . Migrates data from a suspected faulty disk to a hot spare disk immediately after the error count of the suspected faulty disk exceeds the preset threshold.
B . Reduces the occurrence of reconstruction.
C . Improves system reliability.
D . Reduces system performance.

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Answer: ABC