Which of the following statements regarding the digestive system of cockroach are correct? (1) Mouth opens into a short tubular pharynx, leading to a narrow tubular oesophagus (2) Gizzard helps in grinding the food particles (3) A ring of 6–8 blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut and secretes digestive juice (4) A ring of 100–150 yellow, thin Malpighian tubules is present at the junction of midgut and hindgut, helping in removal of excretory products