Please solve the following:

[5 points] In the process of definite integral on f (x ) = 4-", what is the sum value of all the right-hand endpoint of its base? (Riemann Sum) ( A) 8+. (n + 1) (2n + 1) (n + 1) (2n + 1) 3 12 (B) 8- n2 (C) 8- (n - 1) (2n - 1) n2 (D) 8- (n - 1) (2n + 1) (E) 8- (n + 1) (2n - 1) n2 n2