Study the following with reference to respiratory system of Periplaneta

A) Taenidia keep the tracheae always open and prevent them from collapsing

B) Inspiration is an active process and takes place through thoracic spiracles

C) CO₂ from the haemolymph mostly goes out through the inter-segmental membranes of the body wall

D) Opening and closing of spiracles is influenced by CO₂ tension in the tracheae and O₂ tension in the hemolymph

Identify the correct statements