What was the signal agreed upon between Jonathan and David for the latter to flee? I - Jonathan would shoot three arrows and then send a boy to co...

What was the signal agreed upon between Jonathan and David for the latter to flee?

I - Jonathan would shoot three arrows and then send a boy to collect them.
II - Jonathan would shoot an arrow and then send a boy to collect it.
III - Jonathan would light a fire on a hill and David would see it from afar.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) II and III are correct.