Question: Consider the transition system for a beverage vending machine: Which of the following is a liveness property that holds in the above transition system? 1

Consider the transition system for a beverage vending machine:
Which of the following is a liveness property that holds in the above transition system?
1 point
Every third state it 'pay.'
At any point in the execution, one cannot buy coke without paying.
A path cannot have both 'coke' and 'sprite' states.
Two consecutive states will never both have atomic proposition 'drink' hold.
9

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