Which tree is the breadth first search spanning tree of the directed graph (above) if starting at vertex H? When choosing successors, use the 367 convention of alphabetical increasing order A-Z.

a).

i only

b). ii only

c). iii only

d). i and ii only

e). i, ii, and iii are all breadth-first search spanning trees starting at vertex H and following the 367 convention for selecting successors for the above directed graph.