What series of transformations from △abc to △def shows that △abc≅△def ?
a . a reflection across the y-axis followed by a translation of 1 unit right and 2 units up
b . a clockwise rotation of 90° about the origin followed by a translation of 4 units right and 4 units up
c. a reflection across the x-axis followed by a translation of 1 unit right and 1 unit down
d . a reflection across the line y = x followed by a positive rotation of 270° about the center