Select the two correct statements out of the four statements (a - d) given below about cockroach. (a) In females, the 7th abdominal sternum is boat-shaped.(b) In both sexes, the 10th segment bears a pair of unjointed filamentous structures called anal cerci. (c) Males bear a pair of short, thread-like caudal styles which are absent in females.(d) The genital pouch of the female is bounded dorsally by the 9th and 10th terga and ventrally by the 9th sternum.