Which solution should a data architect recommend to meet business requirement?

Universal Container (US) is replacing a home grown CRM solution with Salesforce, UC has decided to migrate operational (Open and active) records to Salesforce, while keeping historical records in legacy system, UC would like historical records to be available in Salesforce on an as needed basis.

Which solution should a data architect recommend to meet business requirement?
A . Leverage real-time integration to pull records into Salesforce.
B. Bring all data Salesforce, and delete it after a year.
C. Leverage mashup to display historical records in Salesforce.
D. Build a chair solution to go the legacy system and display records.

Answer: C