a) the ultimate goal of these Vedic research is material sense gratification.
b) the ultimate goal of these Vedic research is to merge with impersonal lord.
c) these literatures are indirect commentaries given by Vaishnava.
d) the ultimate goal of these Vedic research is to surrender to know Krishna & surrender to him.

The correct answer is
d) the ultimate goal of these Vedic research is to surrender to know Krishna & surrender to him.