Your question is Lift Design. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design how a lift (elevator) works; then simplified to a single user using the lift.
Asked in the technical_2 stage. Treat this as a practical design exercise: first outline the general elevator control problem, then narrow the design to one lift serving one user. Explain the state model, request handling, movement and door behavior, safety constraints, and how you would test the implementation. If you introduce ML, justify why it is needed instead of using deterministic control.