Which of the following is true about an undirected graph G that is 3-edge connected?  1-G must be 3-vertex connected.  2-The edge connectivity of G is at most 3.  3-The edge connectivity of G is at least 3.  4-The vertex connectivity of G is at least 3.  5-G has a vertex of degree < 3 .

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Depth First Search

Depth-first search (DFS) also known as Depth First traversal is an algorithm used to traverse or search the nodes in a tree or graph data structure. Traversal usually means visiting all the nodes of a graph. DFS performs in a depth-ward manner. It uses a stack to remember the vertices it has visited. The search starts from the root node, where any arbitrary node is selected as a root node in a graph, and then each node is explored along each branch before performing backtracking. The DFS algorithm uses a recursive technique by following the idea of backtracking. DFS algorithm does this by performing an in-depth search of all the nodes by traversing in a forward direction. If the required node is not found, it starts backtracking to previously visited nodes.