The variance of random variable x of gamma distribution can be calculated as

• A. Var(x) = n + 2 ⁄ μsup2;
• B. Var(x) = n ⁄ μsup2;
• C. Var (x) = n * 2 ⁄ μsup2;
• D. Var(x) = n - 2 ⁄ μsup3;