Which of the following is considered a 'critical injury' under the OHSA that must be reported immediately to the Ministry of Labour, Immigration, Training and Skills Development (MLITSD) and the police?

1. A sprained ankle that requires time off work.
2. An injury that places life in jeopardy, results in unconsciousness, or involves a fracture of a leg or arm.
3. Any injury requiring first aid treatment at the workplace.
4. An injury resulting in minor cuts and bruises, treated by a paramedic on site.