Consider the following statements about phloem: (1) Phloem transports food materials, usually from leaves to other parts of the plant. (2) It is composed of sieve tube elements, companion cells, phloem parenchyma and phloem fibres. (3) Companion cells are specialised parenchymatous cells closely associated with sieve tube elements. (4) The first-formed primary phloem with narrow sieve tubes is called protophloem, and the later-formed with bigger sieve tubes is metaphloem. Which statements are correct?