Question: In a transportation problem, what indicates that the minimum cost solution has been found? ( if MODI method is being used for optimality test )

In a transportation problem, what indicates that the minimum cost solution has been found? (if MODI method is being used for optimality test)
all the delta values are negative or zero
all the delta values are positive or zero
all the delta values are equal to zero
all the cells in dummy row are empty

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