During the software and configuration backup, which of the following statements is correct?

 During the software and configuration backup, which of the following statements is correct?
A .  To back up the software version, and the same product, the same version should be backed up multiple times
B . License does not need to be backed up
C .  After the configuration of the device is changed, there is no need to back up the configuration file
D .  The purpose of backup is to restore network functions in extreme cases

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Answer: D