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G is an undirected graph with vertex set {v1, v2, v3, v4, v5, v6, v7} and edge set {v1v2, v1v3, v1v4, v2v4, v2v5, v3v4, v4v5, v4v6, v5v6, v6v7}. A breadth first search of the graph is performed with v1 as the root node. Which of the following is a tree edge ?
(A) v2v4
(B) v1v4
(C) v4v5
(D) v3v4

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G is an undirected graph with vertex set {v1, v2, v3, v4, v5, v6, v7} and edge set {v1v2, v1v3, v1v4, v2v4, v2v5, v3v4, v4v5, v4v6, v5v6, v6v7}. A breadth first search of the graph is performed with v1 as the root node. Which of the following is a tree edge ?
(A) v2v4
(B) v1v4
(C) v4v5
(D) v3v4

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G is an undirected graph with vertex set {v1, v2, v3, v4, v5, v6, v7} and edge set {v1v2, v1v3, v1v4, v2v4, v2v5, v3v4, v4v5, v4v6, v5v6, v6v7}. A breadth first search of the graph is performed with v1 as the root node. Which of the following is a tree edge ?
(A) v2v4
(B) v1v4
(C) v4v5
(D) v3v4