A customer would like to convert their existing IBM System Storage DS8100 to a DS8700 to gain more capacity. During the TDA review the impact on the running production environment during conversion is discussed. Which of the following must be considered?（）
- A DS8000 model conversions are generally non-disruptive
- B a model conversion from DS8100 to DS8700 is disruptive
- C the DS8100 base frame needs to be sent back to the factory for upgrade
- D during model conversion the logical configuration can be kept, but the system must be rebooted