Which of the following statements regarding Pascal's triangle are correct?
A. The method for generating Pascal's triangle consists of adding adjacent terms on the preceding row to determine the term below them.
B. The nth row gives the coefficients in the expansion of (x + y)n.
C. Pascal's triangle can be used to expand binomials with positive terms only.
D. The nth row gives the coefficients in the expansion of (x + y)n-1.