Which one of the following statements about Rig Vedic goddesses is correct ?

Which of the following is the correct order of the Vedic literature?

Which one of the following is oldest Veda :

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

Which one of the following Vedic literature talks about salvation :

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