Circle a: center (2, 3) and radius 5 circle b: center (-1, 4) and radius 10 which of the following is the necessary transformation (translation; dilation) from a to b to prove that the two circles are similar? o translation: 3 units left, 1 unit down; scale factor (enlargement ratio): 1/2 o translation: 3 units left, 1 unit up; scale factor (enlargement ratio): 2 o translation: 3 units left, 1 unit up; scale factor (reduction ratio): 2 o translation: 3 units down, 1 unit up; scale factor (enlargement ratio): 1/2