Assuming door is closed and relays are at rest, when door is opened:
#1 Will not work as there is no power to the horn but would work if there was a constant power to pin 85 of the 2nd relay

#2 Will not work as there is no power to the horn unless the relays are energized and they can't be energized since there is no ground for the relay coils.

#3 Will not work since there is no ground for the relay coils


Please correct me if I'm wrong.