Please help me with the following practice questions. Please clearly show the answer and the work required to get that answer. Thank you!

Which of the following is two about the above graph? O The graph has one isolated vertex 0 The graph has no circuits 0 The graph is connected 0 The graph has two parallel edges Removing which of the following edges in the above graph will create a spanning tree? 0 Only edge ad 0 Edges ad and de O Edges ad, df and de 0 Edges ad and df Two edges of a graph are parallel when which of the following is true? 0 The two edges share exactly one vertex 0 Both edges connect the same pair of vertices O The two edges belong to two different graphs 0 The two edges have no vertex in common Which of the following best describes a complete graph? 0 The graph contains a edge between every pair of vertices 0 All the vertices of the graph are isolated 0 Every vertex in the graph has a odd degree 0 The sum of all the degrees of every vertex is odd Given the relation R = {(n, m) | n, m e Z, [n/4J = [m/4J }. Which of the following is one of the equivalence classes of this relation? O {2,4, 6,8} 0 {1, 3, 5,7} O {4, 5, 6,7} 0 {1, 2, 3,4} Given the relation R = {(n, m) | n, m e Z, n