@Tayo Olaomi Correct Answer: B. Inventory and classify the data and assign owners Explanation (CISSP logic): The clues are "unclassified data", "acquired a firm", "30 days" and "regulator exam next quarter". Asset Security starts with knowing what you hold: classification and ownership decide how data is labeled, handled, protected and retained, and nothing downstream, migration included, can be done correctly until those exist. The bank cannot say which of those 20 TB are customer records, which are public and which should never have been kept, and no one is accountable for deciding. Assess before you act: inventory and classify the shares and name owners, and the migration, the encryption and the retention purge all become decisions those owners can make and defend to the examiner. Breakdown: A. Migrating under the bank's default classification is the strong distractor because it meets the 30-day deadline and the data lands inside the bank's own controls. A default label is a guess applied to everything at once, so sensitive records end up under-protected and junk gets the full treatment, and the bank now owns 20 TB it still cannot describe to a regulator. B. ✅ Correct. Inventorying and classifying the data and assigning owners turns an unknown pile into assets with a label, a handling rule and an accountable person. Integration can then migrate in order of sensitivity, and the exam has an answer to "what do you hold and who is responsible for it". C. Encrypting the shares in place protects confidentiality while the data sits, and it is a reasonable interim control. It buys time without buying knowledge, the keys become one more unowned asset, and the examiner will still ask what is inside the encrypted volumes. D. Applying the bank's retention schedule and purging first reduces the volume to migrate and the exposure if something leaks. A retention schedule works by data type and owner, and this data has neither, so a purge would delete records nobody has evaluated, possibly under an acquisition hold.