Which of the following sequences, from outside to inside, is correct? (a) epidermis, retic-ular layer, papillary layer, subcutaneous layer (b) epidermis, subcutaneous layer, reticu-lar layer, papillary layer (c) epidermis, reticular layer, subcutaneous layer, papillarylayer (d) epidermis, papillary layer, reticular layer, subcutaneous layer