Read the following statements and choose the correct option: 1. Feet have webbed digits that help in swimming. 2. Frogs exhibit sexual dimorphism. 3. Female frogs are distinguished by the presence of sound producing vocal sacs and also a copulatory pad on the first digit of the fore limbs which are absent in male frogs. 4. In frogs, nostrils are present 5. The frog never drinks water but absorb it through the skin.