Consider the following graph a. Write down the adjacency matrix and adjacency lists specifying this graph. (Assume that the vertex labels.) b. Starting at vertex a and resolving ties by the vertex alphabetical order, traverse the graph by depth-first search and construct the corresponding depth-first search tree. Give the order in which the vertices were reached for the first time (oushed onto the traversai stack, and the order in which the vertices became dead ends (popped off the stack)