State true (T) or false (F) to the given statements and select the correct option.(A) All tissue layers exterior to vascular cambium constitute bark.(B) Phellogen,phellem,and phelloderm are collectively known as periderm.(C) The peripheral region of secondary xylem is lighter in colour and is known as duramen.(D) Lenticel is lens shaped opening for gaseous exchange and developed during primary growth of plant body.