A private investigator receives a legitimate subpoena to produce specific investigative reports and notes in court. What is their ethical and legal obligation?

1. Comply with the subpoena fully and accurately, while ensuring any privileged or sensitive information not covered by the subpoena remains protected.
2. Refuse to comply, citing client confidentiality and privacy concerns.
3. Only provide summaries of the reports, not the full detailed notes, to protect client privacy.
4. Alter the reports to remove any potentially damaging information for their client before submission.