Which statement directly describes the relationship between δ def and δ d'e'f' ? a. δ def is congruent to δ d'e'f' because you can map δ def to δ d'e'f using a reflection across the y-axis, which is a rigid motion. b. δ def is not congruent to δ d'e'f' because there is no sequence of rigid motions that maps δ def to δ d'e'f'. c. δ def is congruent to δ d'e'f' because you can map δ def to δ d'e'f' using a reflection across the x-axis, which is a rigid motion. d. δ def is congruent to δ d'e'f' because you can map δ def to δ d'e'f' using a rotation of 180° about the origin, which is a rigid motion.