Consider the following about Vedic literatures :
I. The Brahmanas are the treatises relating to prayer and sacrificial ceremony.
II. The upanishads are philosophical texts dealing with topic like the soul, the absolute, the origin of the world and the mysteries of nature.
III. The Aranyakas are called country books.
IV. The author of Ramayana was Vedavyas and that of Mahabharata was Valmiki.
Choose the correct code :