Which one of the following does NOT relate to unauthorized disclosures in the context of cybersecurity?

The reason discussing sensitive information with cleared contractors does not relate to unauthorized disclosures in the context of cybersecurity is that cleared contractors are individuals who have received background checks and have been granted official clearance to access sensitive information. When properly trained, these contractors are authorized to handle and discuss sensitive information, thereby reducing the risk of unauthorized disclosure.

In contrast, the other scenarios involve situations where sensitive information could be exposed without proper authorization or safeguards in place. Data leaks from a ransomware attack could result in unauthorized access to sensitive information, while accidental emailing of classified documents denotes a breach in protocol that can lead to unintended disclosures. Mishandling classified access during a network upgrade could similarly create vulnerabilities that might be exploited, leading to potential unauthorized disclosures.