When are data and documents with legacy markings from or for the DoD required to be re-marked or redacted?

When are data and documents with legacy markings from or for the DoD required to be re-marked or redacted?
A . When under the control of the DoD
B . When the document is considered secret
C . When a document is being shared outside of the organization
D . When a derivative document’s original information is not CUI

Answer: C