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