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Let A = [25, 21, 98, 100, 76, 22, 43, 60, 89, 87) and the task is to use the Median of Medians algorithm to determine the 4th smallest element What is the index of the resulting pivot after partition is done (assume 1-based array)? Select one: a. 1 b. 2 C3 d. 4 e. 5