Which of the following statement(s) is/are correct regarding respiratory system of cockroach ?

($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.

($ii$) Thin branching tubes carry oxygen from the air to all the parts.

($iii$) The opening of the spiracles is regulated by sphincters.

($iv$) Exchange of gases take place at the tracheoles by diffusion.

• A

  Only $(i)$

• B

  $(i), (ii) \;and \;(iii)$

• C

  $(ii), (iii) \;and \;(iv)$

• D

  All of these