Consider the following matrix: 1 DO 0 ( 1 1 OFON 1 A = 1 0 01 0 0 01 101 2 01010 Which of the following is most true? This must be the adjacenty matrix for a graph (it can't be a digraph) This must be the adjacenty matrix for a digraph (it can't be a regular graph) This is not a valid adjacenty matrix - that is, there is no graph or digraph that has this for its adjacenty matrix This could be the adjacenty matrix for either a graph or a digraph