Why should the upgrade_export configuration file (.tgz) be deleted after you complete the import process?

Why should the upgrade_export configuration file (.tgz) be deleted after you complete the import process?

A.
It will conflict with any future upgrades when using SmartUpdate.

B.
SmartUpdate will start a new installation process if the machine is rebooted.

C.
It contains your security configuration, which could be exploited.

D.
It will prevent a future successful upgrade_export since the .tgz file cannot be overwritten.