Circle J is located in the first quadrant with center (a, b) and radius s. Felipe transforms Circle J to prove that it is similar to any circle centered at the origin wuth radius r. Which sequence of transformations did Felipe use?
a. translate circle J by(x+a, y+b) and dilate by a factor of t/s
b. translate circle J by (x+a, y+b) and dilate by a factor of s/t
c. translate circle J by (x-a, y-b) and dilate by a factor of t/s
d. translate circle J by (x-a, y-b) and dilate by a factor of s/t