I know that #3 is the best option, but what is meant by restricting sorting to first array elements? Wouldn't arraySize just include the entire array and sort the entire array? How does it "restrict sorting to first array elements"? (first array elements is what I am caught up on - thought it would sort all array elements)

2) Which method signature is best for sorting an oversize array? void sort(int [] arrayRef) void sort(int[] arrayRef, int arraySize) void sort(int[] arrayRef, int fromIndex, int toindex) int [ sort (int[] arrayRef, int fromIndex, int toindex)