Select the correct sequence from outside to inside in a dorsiventral leaf:
1
Cuticle → Adaxial epidermis → Palisade → Spongy → Abaxial epidermis
2
Adaxial epidermis → Cuticle → Palisade → Spongy → Abaxial epidermis
3
Cuticle → Abaxial epidermis → Spongy → Palisade → Adaxial epidermis
4
Adaxial epidermis → Spongy → Palisade → Abaxial epidermis → Cuticle