B makes most sense, since historical records are part of legal requirements, and retention should be confirmed FIRST from the respective record owners, in order to come to a decision to either move them to Cloud, or to get rid of them. No one wants to store stuffs in Cloud which are not required anymore as the storage also comes with some costs. After confirmation from the record owners, even if those records are needed, it will be easier to categorize which type of cloud storage tier is needed, Hot tier, cold tier, cool or archive tier.