Which hand is North’s?

Can you identify which of the four proposed hands matches North’s bidding in the sequence shown and say what you would have done with the other three?

Slam bidding is important… But if the bids are not understood correctly, they can quickly lead to accidents!

North is at the steering wheel here. Note that in each of the hands, North has a very powerful two-suiter, which you should not open as a semi-forcing. South’s 3♠, invitational, promises exactly four trumps and 11-12 points (distribution included) and is enough for North to ask for keycards. When South answers 5♥, showing two keycards without the trump Queen, what other information could North be looking for?

One thing is sure when he continues with another asking bid: North thinks about playing the grand slam. With hand 1, it would be unreasonable to go there; North knows they have only nine trumps lacking the Queen, so he should sign off in 6♠.