Which officer was known as 'Bhagadugha' during Vedic administration?

Which of the following animals was considered as “Aghanya” during the Vedic period:-

Which one of the following Vedic literature talks about salvation :

Vedic river Askini is identified with which one of the following rivers?

Which of the following Rig-Vedic Gods is not mentioned in 'Boghazkoi' inscription?

The compilation of which among the following is based upon the Rig Veda?