Which security concept is based on preventing unauthorized access to data while also ensuring that it is accessible to those authorized to use it? 

Answer options:

A. Integrity
B. Availability
C. Confidentiality
D. Nonrepudiation

C

The main goal of confidentiality is to ensure that sensitive information is not made available or leaked to parties that should not have access to it, while at the same time ensuring that those with appropriate need and authorization to access it can do so in a manner commensurate with their needs and confidentiality requirements.