Read the following  statements carefully.A. The presence of vessels is a characteristic feature of angiosperms.B. Xylem fibres have highly thickened walls and obliterated central lumens.C. Xylem parenchyma cells are living and thin walled and their cell walls are made up of cellulose.D. Xylem parenchyma stores food material in the form of starch, fat and other substances such as tannins.      How many statements are correct?