Below is a 2D array: 2 6 2 4 9 5 7 3 8 5 4 4 1 5 9 a. What number is at index [1, 3]? b. If you used an Array Subset function on the above array, and assigned the following input values (in order): index: 2 length: 3 index: 3 length: 2 What value(s) would be returned? Would it be a 1D or 2D array