Access to sensitive or restricted information is controlled describes which of the key communications and information systems principles? a. reliability, scalability, and portability b. interoperability c. security d. resilience and redundancy

C: Security

Explanation:

Communications and information systems principles need to be, among other things, secure. They need to be able to protect sensitive information from those who intentionally not need to know. Some incident information like voice, networks, and data, are very sensitive and thus, should be secure to the right levels and should comply with privacy laws and data protection.