The figure shows two triangles on a coordinate grid: what set of transformations is performed on triangle abc to form triangle a'b'c'? a: a translation 5 units up followed by a 180 degree counterclockwise rotation about the origin b: a translation 5 units up followed by a 270 degree counterclockwise rotation about the origin c: a 180 degree counterclockwise rotation about the origin followed by a translation 5 units to the left d: a 270 degree counterclockwise rotation about the origin followed by a translation 5 units to the left