Select the correct statements about religious beliefs of the Rig Vedic Period :

1. IDyus was a celestial God of the Rig Vedic Aryans similar to Jupiter of the Greeks.
2. IIPrithvi was considered as the mother of all Gods.
3. IIIAgni was worshiped as the intermediary of taking the offerings to the deities.
4. IVCow sacrifice was also a part of worship.