In the following graph, discovery time stamps and finishing time stamps of Depth First Search (DFS) are shown as x/y, where x is discovery time stamp and y is finishing time stamp. <image 1> shows which of the following depth first forests?
['{a, b, e} {c, d, h} {f, g}', '{a, b, e} {f, g} {c, d} {h}', '{a, b, e} {f, g} {c, d} {h}', '{a, b, e} {c, d, f, g, h}']