Question

mentioned four Vedas of Vedic period​

Answer 1

Answer:

There are four "Vedic" Samhitas: the Rig-Veda, Yajur-Veda, Sama-Veda and Atharva-Veda, most of which are available in several recensions (śākhā). In some contexts, the term Veda is used to refer only to these Samhitas, the collection of mantras.

Answer 2

Rigveda,Yajurveda,Samaveda