Consider the following statements :
1. Unit digit in `17^(174)` is 9.
2. Difference of the squares of any two odd numbers is always divisible by 8.
3. Adding 1 to the product of two consecutive odd numbers makes it a perfect-square.
Which of the above statements are correct?

Options

A. 1, 2 and 3
B. 1 and 2 only
C. 2 and 3 only
D. 1 and 3 only