Which of the following must hold good for the expansion of the binomial x4 + 1/x3)15 ?
(A) There exist a term which is independent of x.
(B) 8 th and 9 th terms of the expansion have the greatest binomial coefficient
(C) Coefficients of x 32 and x -17 are equal
(D) If x = √2 , then number of rational terms in the expansion is 5