Which of the following threats occurs due to the loss of relevant encryption keys?

The correct choice relates to how the loss of relevant encryption keys can directly lead to data loss. When encryption keys are lost, encrypted data becomes inaccessible because the keys are necessary for decrypting that data. This can result in significant issues, especially if the lost data is essential for business operations or regulatory compliance.

In the context of cloud security, losing encryption keys means that even if the data exists in the cloud, it cannot be retrieved or used. This highlights the importance of key management practices, where organizations must ensure that keys are securely stored, frequently backed up, and easily recoverable by authorized personnel when needed.

While insider threats, service traffic hijacking, and data breaches are important security concerns, they are not directly caused by the loss of encryption keys. Instead, they involve other aspects of security, such as unauthorized access, interception of data, or exploitation of vulnerabilities. Hence, the loss of encryption keys primarily results in data loss, highlighting the critical nature of effective key management in cloud security strategies.