Which of the following represents the correct combination without any exception?

	Characteristics	Class
1)	Mouth terminal ; moist skin without scales ; two pairs of limbs ; eyes with eye lids	Amphibia
2)	Bony endoskeleton ; gills with operculum ; skin with placoid scales ; internal fertilisation	Osteichthyes
3)	Body covered by cornified skin ; external ear openings absent ; three – chambered heart ; internal fertilisation	Reptilia
4)	Body covered with feathers ; bony endoskeleton ; oviparous ; direct development	Aves