Preservation of confidentiality within information systems requires that the information is not disclosed to: 

Answer options:

A. Authorized person
B. Unauthorized persons or processes.
C. Unauthorized persons.
D. Authorized persons and processes

B

Confidentiality assures that the information is not disclosed to unauthorized persons or processes. Source: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 31.