For the expansion `(xsinp+x^(-1)cosp)^(10),(p in R),` The greatest value of the term independent of `x` is `(a)10 !//2^5(5!)^2` (b)the least value of sum of coefficient is zero (c)the greatest value of sum of coefficient is 32 (d)the least value of the term independent of `x` occurs when `p=(2n+1)pi/4, n in Z`