Q5: Here is a table with information about some students: \begin{tabular}{[lllll} Thline Name & StudentID & Credits & GPA Joe Smith & 123456 & 20 & $3.2$ Abby Jones & 234567 & 24 & $3.6$ $\ldots $ & & \hline \end{tabular) And a ToDo list transaction based on Joe earning an A in a 4 credit class. Start transaction Add 4 credits to Joe Change Joe's GPA to $3.66$ End transaction A) Why are the actions not idempotent? What could go wrong if we crash midway through the list? B) Rewrite the todo list so that the actions are idempotent. Q6: Why might a database need to undo part of a transaction? cs.vs. 1236