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Which statement about customizing the data model is true?

A$.$ Data Model changes should be made in a private scenario to ensure that multiple administrators don't overwrite each others changes.

B$.$ Key fields can only be modified for custom data models.

C$.$ The standard RapidResponse data models can be modified so that that they align to an externally produced extract file.

D$.$ Applying data model changes can result in data loss.

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