A bank acquired a firm whose file shares hold 20 TB of unclassified data. Integration wants it in the bank's cloud tenant in 30 days, with a regulator exam next quarter. What should the security manager do FIRST?
A. Migrate it under the bank's default classification
B. Inventory and classify the data and assign owners
C. Encrypt the shares in place until the exam ends
D. Apply the bank's retention schedule and purge first
(Explain your answer for more points in the comments!)