During uncoupling, after chocking the trailer wheels and lowering the landing gear, what is the correct sequence of the next major steps?

1. Pull the fifth wheel release, pull tractor completely clear, then disconnect lines.
2. Disconnect air/electrical lines, pull tractor completely clear, then pull the fifth wheel release.
3. Disconnect air/electrical lines, pull the fifth wheel release, then pull the tractor partially clear of the trailer.
4. Pull tractor partially clear, disconnect lines, then pull the fifth wheel release.