Given the array [13, 1, 3, 2, 8, 21,5,1], suppose we choose the pivot to be 1, the second element in the array. Which of the following would be valid partitions? 11,2,3,5,8, 13, 21] 113,1,3,2,8,21,i5 113, 3,2,8,21,5,1 O [13]1 3,2,8, 21,5, 1] 13, 1,3,2,8,21,51