Select the correct statement about sexual dimorphism.

In cartilaginous fishes (Chondrichthyes, e.g., Scoliodon), pelvic fins of male bear claspers which serve as intromittent (copulatory) organs. 

In Aschelminthes (e.g., Ascaris), often female is longer than male. 

In cockroach, anal styles are present in male but not female. 

Vocal cords are present in both male and female frogs. Vocal sacs are present only in male frogs.