In the following code to add an edge in the LinkedDirectedGraph class, what is the missing code?
def addEdge(self, fromLabel, toLabel, weight): fromVertex = self.getVertex(fromLabel) fromVertex.addEdgeTo(toVertex, weight) self.edgeCount += 1
A. self.getVertex(toLabel) = fromVertex
B. fromVertex.addEdgeTo(fromVertex, weight)
C. self.weight += 1
D. toVertex = self.getVertex(toLabel)
Answer: D
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