An organization is designing a large enterprise-wide document repository system. They plan to have several different cla

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An organization is designing a large enterprise-wide document repository system. They plan to have several different classification level areas with increasing levels of controls. The BEST way to ensure document confidentiality in the repository is to:

A. encrypt the contents of the repository and document any exceptions to that requirement
B. utilize Intrusion Detection System (IDS) set drop connections if too many requests for documents are detected
C. keep individuals with access to high security areas from saving those documents into lower security areas
D. require individuals with access to the system to sign Non-Disclosure Agreements (NDA)