(a) Breadth First Search uses a queue data structure. First store the value for every node as 0 which shows node unvisited. Start entering the vertices into the queue if they are not visited. While removing the element from queue mark it as visited and enter the adjacent nodes if they are not visited.
(d) Depth First Search uses a stack data structure. First store the value for every node as 0 which shows node unvisited. Start pushing the vertices into the stack if they are not visited and mark it as visited and print it then Push the adjacent nodes. If there is no unvisited node available then pop.
Steps:
DFS Sequence: ABCDEFGH
(c) In Kruskal's Algorithm choose the minimum available edge from the graph and check if it is forming a cycle with the spanning tree formed so far then discard the edge else include the edge in the spanning tree.
(d) Weight of Minimum Spanning Tree = 1 + 3 + 6 + 1 + 5 + 4 + 4 = 24
If you're still having any doubt then please feel free to ask in the comment section.
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