Which of the following are the worst-case running times of insertion sort, merge sort, and quick sort respectively?
a. O(n^2), O(n log n), and O(n^2)
b. O(nlog(n)), O(nlog(n)), and O(n^2)
c. O(n^2), O(n^2), and O(n log(n))
d. O(n^2), O(n log(n)), and O(n log(n))
Insertion sort takes O(n^2) in worst case, as we need to run two loops. Merge sort takes O (n log(n)) time in all cases. Quick sort takes O(n^2) in worst case.
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