What is essential for ensuring data accuracy for individuals’ personally identifiable information (PII)?

Accessing their own data is essential for ensuring data accuracy for individuals' personally identifiable information (PII) because it allows individuals to verify the accuracy and completeness of the information being held about them. By having the opportunity to review their data, individuals can identify any discrepancies, such as incorrect details or outdated information, and take the necessary steps to rectify these issues. This process promotes data integrity and compliance with privacy regulations, which require that PII be accurate and up to date.

The other options do not contribute to ensuring data accuracy. Spying on other people is unethical and does not relate to verification of one's own PII. Sharing data with friends can lead to misinformation and breaches of privacy, rather than ensuring accuracy. Researching for an autobiography might involve gathering information, but it does not directly relate to verifying or correcting one's own PII. Overall, accessing one's own data is the most effective means of ensuring its accuracy and integrity.