The coefficients corresponding to k = 0, 1, 2, 5 in the expansion of (x + y)^5 are
a. 1, 5, 10, 10, 5, 1
b. 1, 5, 10, 5, 1
c. 0, 1, 5, 10, 5, 1, 0
d. 0, 5, 10, 10, 5, 0