Answer the following question by writing codes in R. The answer can only be shown in R codes (a) Write a function to compute the kth term in 112k+2 where d-l is an integer, a is a vector in Rd, and II II denotes the Euclidean norm. Perform the arithmetic so that the coefficients can be computed for (almost) arbitrarily large k and d. (This sum converges for all a E Rd) (b) Modify the function so that it computes and returns the sum (c) Evaluate the sum when a -(1,2) Results need to be shown in R Codes