Which of the following statements about tissue system is true?

(i) Epidermal cells are parenchymatous with a small amount of cytoplasm lining the cell wall and a large vacuole.

(ii) The outside of the epidermis is often covered with a waxy thick layer called the cuticle which present in root and other part.

(iii) In grasses, the guard cells are bean shaped.

(iv) The outer walls of guard cells are thick and the inner walls are highly thin.

(v) Sometimes, a few epidermal cells, in the vicinity of the guard cells become specialized in their shape and size and are known as subsidiary cells.