Which step is particularly important with black box auditing?

Notifying the FBI of the need for a black ops hacking expert

Assigning a computer engineer subject matter expert to the audit team

Making sure all the staff can fit in the black box

Keeping all audit documentation secret from the client, including call notes and internal discussions.

Documenting all data inputs and data outputs and performing reconciliations that show what and how the data was manipulated by the system