△ABC has vertices A(1,7),B(5,5) and C(4,3), and is rotated 270° counterclockwise about the origin. Which sequence of additional transformations maps △ABC onto △A′B′C′? A) a reflection over the y-axis followed by a translation of 2 units down B) a reflection over the y-axis followed by a translation of 1 unit right and 1 unit up C) a translation of 2 units right and 1 unit up followed by a reflection over the line of x=2