Regarding the disaster recovery drills, which of the following statement is incorrect?

Regarding the disaster recovery drills, which of the following statement is incorrect?
A . Perform the drills in accordance with the real disaster recovery steps.
B. Familiarize with the disaster recovery process through disaster recovery, and exercise business recovery capabilities when a disaster strikes
C. Through disaster tolerance drills, business integrity cannot be checked
D. Disaster recovery drills are verification and the most effective means to prove the availability of the system

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Answer: C