Which of the following structures of Periplaneta is/are correctly matched with their function?

Spiracles – Respiration 

Spiracles are the small openings located along the sides of the body of insects, including cockroaches. They serve as the entry points for air into the insect's respiratory system. Air enters the spiracles and travels through a network of tubes called tracheae, which branch throughout the insect's body, delivering oxygen directly to the cells and removing carbon dioxide.

Malpighian tubules – Excretion

Hepatic caecae – Digestion

Alary muscles – Circulation