Option a is the correct answer Rig Veda, Yajur Veda and Sama Veda are collectively referred to as trayi Veda in Satapatha Brahmana. Rig Veda has hymns glorifying the Vedic gods for the prosperity of the people, Yajur Veda supplies the details relating to the sacrifices and Sama Veda contains hymns mostly culled from Rig Veda to be sung in order to praise the gods and manes. Atharva Veda is the youngest of all the four Vedas and was not present when Trayi Veda was introduced. Hence, Atharva Veda is not a part of Trayi Veda. Important Tips Satapatha Brahmana: The Satapatha Brahmana is an explanation of the Shukla Yajurveda. It is attributed to the Vedic sage Yajnavalkya. Predominantly in its explanation of sacrificial ceremonies, the Satapatha Brahmana delivers technical information of geometry and experimental astrophysics from the Vedic era. Shatapatha Brahmana gives details about expansion of the Aryans to the eastern part of the Indian subcontinent and refers to the eastern rivers, such as the Ganga and the Yamuna, and that it mentions the presence of Aryan settlements in these areas as well. Solution: (c) Exp) Option c is the correct answer Chenab was known as 'Askini' in the Rig Vedic Period. This river is traditionally known as Chandrabhaga River. Important Tips Ancient River Modern Name Sindhu Indus Sutudri Satluj Vitasta Jhelum Vipasa Beas Askini Chenab Parushni Ravi Solution: (c) Exp) Option c is the correct answer The Kabul or kubha River emerges in the Sanglakh Range of the Hindu Kush Mountains in Afghanistan. More specifically, this river is the main river in the eastern part of Afghanistan. It is also known as the Kabal River. This river is also mentioned in the Rig Veda, the earliest scripture of Hinduism, under the name of Kubha.