(1) If you have waited two hours and you have not seen the parents of the bird, (2) It's time to rescue it.

What is the BEST way to combine sentence (1) and (2)?

Select one:

It's time to rescue it, after two hours if the parents of the bird aren't there yet.

If you have waited two hours and you have not seen the parents of the bird, it's time to rescue it.

If you have waited two hours and you have not seen the parents, of the bird, it's time to rescue it.

If you have not seen the parents, and it's been two hours, and it's time to rescue it