Triangle PQR is translated by the rule (x − 1, y − 1) and then dilated by a scale factor of 3 centered at the origin. Which statement describes the properties of triangles PQR and P''Q''R'' after the transformations?

∠P and ∠P'' are congruent after the translation, but not after the dilation.
∠P and ∠P'' are congruent after the dilation, but not after the translation.
and are congruent after the translation, but not after the dilation.
and are congruent after the dilation, but not after the translation.