The code R4P7 is written with straight strokes in front of the dashed mirror. Which panel shows exactly what is seen in the mirror?

The mirror reverses the order (7 first, R last) and flips every symbol: the 7 opens to the left, the P and R face left and the 4 has its upright on the left: (b). (a) looks almost right but its P still faces right; (c) and (d) turn the code upside down.