Under the PSISA, what is a licensed security guard's obligation regarding their licence while on duty?

1. They must keep the licence displayed in a clearly visible place on their outermost garment at all times.
2. They must carry the licence and, on request, identify themselves as a security guard and produce the licence.
3. They must leave the licence with their employer for safekeeping during the shift.
4. They only need to carry the licence when working in uniform, not in plain clothes.