If the sum of the n terms of an AP is cn(n — 1) where c is not equal to 0, the sum of the squares of these terms is :

• A. c^2n^2(n + 1)^2
• B. 2/3 {c^2n(n — 1)}
• C. 2/3 c^2n (n + 1) (2n + 1)
• D. c^2n (n — 1) (2n -1)5)None of the above