Which of the following scenarios illustrates a violation of data ethics?

The scenario that illustrates a violation of data ethics is when a website collects personal data without informing users. In ethical data practices, transparency is paramount. Users have the right to know what personal information is being collected about them, how it will be used, and who it may be shared with. Failing to inform users about data collection undermines their autonomy and disregards the ethical obligation to obtain informed consent. This lack of transparency can lead to a breach of trust and potential misuse of personal information, which is why it clearly constitutes a violation of data ethics.

In contrast, the other scenarios represent ethical practices. Using anonymized data for research respects individual privacy; obtaining consent from participants ensures they are willingly providing their information; and implementing data protection measures demonstrates a commitment to safeguarding personal data. These actions align with ethical standards in data handling and usage.