If $\;a_{1},a_{2},a_{3}\;(a_{1}\;\geq\;0)$ are in GP with common ratio r . the value of r for which inequality $\;a_{3}\;\geq\;4a_{2}-3a_{1}$ holds is given by ,

Question

$(a)\;r=6\qquad(b)\;r=1\qquad(c)\;r=2\qquad(d)\;r=3$