Which of the following is the earliest of the four Vedas and forms the foundation of Vedic literature?

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

Which one of the following Vedic literature talks about salvation :

Which one of the following is oldest Veda :

Which one of the following four Vedas contains an account of magical charms and spells?

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