What does this sign mean?

Only commercial vehicles can park here, and only for five minutes

Any vehicle can park here, but it must not be left unattended for more than five minutes

Any vehicle can park here to unload goods or people, but only for five minutes and then it has to be moved

Any vehicle can park here to unload goods or people, but it must not be left unattended for more than five minutes

This parking area is designated for loading and unloading goods or for picking up and dropping off passengers. If there is no sign indicating "Commercial," any vehicle may park here. The vehicle can be unoccupied, but the duration must not exceed 5 minutes.