Question $21$

$16$ pts

An undirected graph $G$ is shown below. We assume that we are using adjacency lists as the graph representation. We further assume that the vertices on the adjacency lists are listed alphabetically. For example, if both $x$ and $Y$ are on the adjacency list of vertex $Z,$ then $x$ is ahead of $Y$ on the list of $Z.$

Answer the following questions.

$($a$)$ What is the third node on the adjacency list of node A$?$

$($b$)$ What is the third node on the adjacency list of Node B$?$

$($c$)$ What is the second node on the adjacency list of node C$?$

$($d$)$ What is the second node on the adjacency list of node D$?$