Quigley Computing regularly ships tapes of backup data across the country to a secondary facility. These tapes contain confidential information. What is the most important security control that Quigley can use to protect these tapes?

Quigley may choose to use any or all of these security controls, but data encryption is, by far, the most important control. It protects the confidentiality of data stored on the tapes, which are most vulnerable to theft while in transit between two secure locations.