Under the Private Security and Investigative Services Act, 2005 (PSISA), which of the following individuals is required to hold a valid private investigator license in Ontario?

1. A police officer performing duties as part of their employment with a police service.
2. An individual who, for remuneration, conducts investigations to locate missing persons.
3. A journalist gathering information for a news report.
4. A lawyer conducting investigations solely for the purpose of litigation for their client.