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)

Question

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)
< missing code >
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)

Quizplus · Accepted Answer

The missing code should retrieve the vertex corresponding to the "toLabel" parameter by calling the getVertex() method and assign it to a variable named "toVertex". This variable will be used later to add the edge from the "fromVertex" to the "toVertex". Hence, option D is the correct choice as it assigns the retrieved value to the toVertex.

In the Following Code to Add an Edge in the LinkedDirectedGraph