The principle of accuracy in the GDPR requires which of the following?

The principle of accuracy in the GDPR emphasizes that personal data must be kept up to date and accurate. This means that organizations are required to ensure that any information they hold about individuals reflects the current state of affairs. They must take necessary steps to rectify or update data without delay when inaccuracies are discovered, thereby maintaining data integrity and reliability.

This principle is integral to protecting individuals' rights and ensuring that decisions based on personal data are fair and just. Stale or incorrect data could lead to negative consequences for individuals, such as being denied services or facing unjustified decisions.

In contrast, other options do not align with the GDPR's principle of accuracy. Collecting data from multiple sources might enhance comprehensiveness but does not specifically address accuracy. The assertion that all data must be deleted after a year contradicts the GDPR's requirement for data minimization and retention schedules based on necessity. Lastly, while anonymizing data can enhance privacy, it is not a stipulation under the accuracy principle.