Social engineering is a privacy threat that the privacy technologist should consider when designing a new system.

Destroying all encryption keys associated with encrypted data stored on a cloud server would make that encrypted data inaccessible even if it still exists on that server 4.

a privacy consideration for NOT sending large-scale SPAM type emails to a database of email addresses is that the emails are unsolicited. Sending unsolicited emails can violate individuals' privacy rights and may also be illegal under certain anti-spam laws.

Retagging is not a suitable action to apply to data when the retention period ends2. Retagging means changing the classification or label of data based on its sensitivity or value2. Retagging does not reduce the risk of unauthorized access or disclosure of personal data that is no longer needed by the organization2. The other options are suitable actions to apply to data when the retention period ends, as they either remove or anonymize personal data2.