Triangle 1 is transformed onto triangle 2 in the graph below.

On a coordinate plane, triangle 1 is rotated to form triangle 2.

Which statement about the transformation is true?
1.The transformation is a reflection because triangle 2 is a flip of triangle 1.
2.The transformation is a dilation because triangle 2 is a different size than triangle 1.
3.The transformation is a vertical translation because triangle 1 slid vertically.
4.The transformation is a rotation because triangle 2 is a quarter turn of triangle 1.