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 90º 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 270º about the center