Which sorting algorithm is considered stable and has a time complexity

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Module 1: Introduction

20232m

Which sorting algorithm is considered stable and has a time complexity of $O(n^2)$ ?
(i) Quick sort
(ii) Merge sort
(iii) Insertion sort
(iv) Selection sort

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Answer: (iii) Insertion sort

Insertion sort stable O(n²) worst, adaptive O(n) nearly sorted. Merge stable O(n log n), Quick unstable, Selection unstable. Question expects insertion.

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