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In a directed graph, define a vertex as source if it has indegree zero. Also, define a vertex as sink if it has out-degree zero.

In a directed graph, define a vertex as source if it has indegree zero. Also, define a vertex as sink if it has out-degree zero. Given a directed acyclic graph G = (V,E). If discovery time and finishing time are obtained by applying standard DFS, which is the property of vertex that is guaranteed to be a source?

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