Select the correct text in the passage. Angela wrote the following merge sort class in Java one afternoon. In which line is she testing the base case?
public class MergeSortD{ public static void mergeSort(double[] input) { if (input. length 1) return; int length1 = input. length/2; int length2 = input. length - input. length/2; double[] array1 = new double[length1]; double[] array2 = new double[length2]; for (int i = 0; i < length1; { array1 [i] = input[i]; for (int i = 0; i < length2; i++) { array[i] = input[i + length1]; } mergeSort(array1); merge Sort(array2); int front1 = 0, front2 = 0, inputPosition = 0; while (front1 < length1 && front2