Under the Criminal Code of Canada, a private citizen (including a security guard) can make a citizen's arrest without a warrant if they find a person committing an indictable offence. What is the specific requirement for arresting someone for a *summary conviction* offence?

1. They must find the person committing the summary conviction offence, and the person must be caught in the act.
2. Citizen's arrest powers only apply to indictable offences, not summary conviction offences.
3. They can arrest on reasonable grounds that a summary conviction offence has been committed.
4. They can arrest if the summary conviction offence is committed on the property they are guarding.