Which of the following statements regarding pascal's triangle are correct?
a. each row is a \"palindrome\" — that is, it is the same if read from left to right or from right to left.
b. the coefficients of (x + y)n are given by the nth row of pascal's triangle.
c. to generate pascal's triangle, add adjacent terms on a row to determine the term directly below them.
d. the nth row gives the coefficients in the expansion of (x + y) n-1.