Consider a 4-by-4 double array, arrD and writeresponses for the following questions:

1. Write the declaration of arrD.
2. How many elements does the array have?
3. Write a single-line statement that sets the elementat row 2 and column4 to 4.20.
4. Write a for-loop (without nested) thatprints the elements of first column of the array. Writeonly the for-loop code, not the complete C++program.
5. Write a for-loop (without nested) that prints the sum of thediagonal elements of the array. Write onlythe for-loop code, not the complete C++program.