Question: The Java topologicalSort ( ) method initializes noIncoming as a list of vertices with no incoming edges. topologicalSort ( ) ' s while loop continues

The Java topologicalSort() method initializes noIncoming as a list of vertices with no incoming edges. topologicalSort()'s while loop continues while noIncoming _____.
Question 18 options:
is not null
has all the graph's vertices
is empty
is not empty

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