Which operation may use a place in a city or town that is not an airport, if it creates no hazard?

1. 1A photography flight.
2. 2A private pleasure flight.
3. 3A flight lesson.
4. 4A police operation.

Source: Canadian Aviation Regulations (SOR/96-433), CAR 602.13(2) Take-offs, Approaches and Landings within Built-up Areas of Cities and Towns