Which of the following is a Samhita of Shukla Yajurveda?

Which one of the following is oldest Veda :

Which of the following is a characteristic of Mandala IX of the Rigveda?

Which of the following Vedas is divided into two branches as Krishna and Shukla ?

Which of the following Gods is referred to as 'Ritasya Gopa' in the Rigveda?

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