Question

The triangles are congruent because △R′S′T′△R′S′T′ is a translation of △RST△RST , and a translation is a rigid motion.

The triangles are congruent because △R′S′T′△R′S′T′ is a rotation of △RST△RST , and a rotation is a rigid motion.

The triangles are not congruent because △R′S′T′△R′S′T′ is a rotation of △RST△RST , and a rotation is not a rigid motion.

The triangles are not congruent because △R′S′T′△R′S′T′ is a translation of △RST△RST , and a translation is not a rigid motion.