a. This could be the adjacency matrix for either a graph or a digraphb. This must be the adjacency matrix for a digraph(it can't be a regular graph)c. This is not a valid adjacency matrix- that is, there's no graph or digraph that has this for its adjacency matrix d. This must be the adjacency matrix for a graph(it can't be a digraph)

0 0 0 A OHOOO HHOOK OHHOO OOOH 0 0 Which of the following is most true