Given an array of integers, find a tuple of three integers that can form a triangle.

To find three integers in an array that can form a triangle, first sort the array in ascending order. Then, iterate through the sorted array, checking every triplet of consecutive elements (a, b, c). If the triangle inequality holds (a + b > c), you've found a valid triangle and can return this triplet. If you iterate through the entire array without finding such a triplet, return null. This method is efficient, with a time complexity dominated by the sorting step, resulting in O(n log n).