The rule (x, y)→(−x,−y) maps △rst to △r′s′t′which statement correctly describes the relationship between △rst and △r′s′t′ ? a. the triangles are not congruent because △r′s′t′ is a rotation of △rst , and a rotation is not a rigid motion. b. the triangles are not congruent because △r′s′t′ is a translation of △rst , and a translation is not a rigid motion. c. the triangles are congruent because △r′s′t′ is a rotation of △rst , and a rotation is a rigid motion. d. the triangles are congruent because △r′s′t′ is a translation of △rst , and a translation is a rigid motion.