Let x1, x2, ..., xn be values taken by variable x, and y1, y2, y3, ..., yn be the values taken by variable y such that yi = axi + b, for i = 1, 2, ..., n. Which of the following is/are correct?
A) The values of y form an arithmetic progression
B) The values of y form a geometric progression
C) The values of y form a linear progression
D) Both A and B