Identify the correct sequence of anther wall layers from periphery towards core part.
(a) Epidermis → endothelium → stomium → tapetum
(b) Epidermis → middle layer → endothecium → endothelium
(c) Epidermis → endothelium → middle layers → tapetum
(d) Epidermis → endothelium → endothecium → tapetum
