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The correct choice identifies that manually generated timestamped audit trails are not a requirement for compliance under 21 CFR Part 11. Instead, the regulation mandates that systems must have automated audit trails that capture the date and time of operator entries and actions related to electronic records. The use of automated systems is emphasized to ensure the integrity and reliability of the records.

In the context of the other requirements:

- The validation of systems is pivotal to ensure that the electronic records are accurate, consistent, and reliable over their lifecycle. This is a fundamental principle of compliance under 21 CFR Part 11, as it ensures that the systems perform as intended.

- Authority checks are crucial for protecting the integrity of electronic records. This includes ensuring that only authorized individuals have access to create, modify, or delete records, which prevents unauthorized changes and maintains data integrity.

- Establishing and adhering to written procedures is essential for ensuring that there are clear guidelines and processes in place for handling electronic records and signatures. This not only supports compliance but also helps in maintaining consistent practices across an organization.

In summary, while features like audit trails are necessary, they must be automated rather than manually generated, thus making the identification of manual timestamping as non-compliant under this regulation.