Sequence of cellular layers from the periphery towards the cortex in an old dicot stem is
a) Epidermis, hypodermis, phellogen, phelloderm
b) Epidermis, phellogen, phellem, epidermis
c) Epidermis, hypodermis, cortex, endodermis
d) Epidermis, phellem, phellogen, phelloderm