Under the Private Security and Investigative Services Act, 2005 (PSISA), what is a primary ethical obligation of a private investigator regarding client information?

1. To disclose client information to other PIs for networking and case collaboration purposes.
2. To maintain strict confidentiality of all client information, unless legally compelled or authorized by the client to disclose.
3. To share client information with law enforcement without client consent if it could aid an investigation.
4. To use client information for personal gain or to further one's own business interests if it doesn't directly harm the client.