What can be the vertex for the equation $y=3x^2-4x+1$ ?

Question

$\begin{array}{1 1} (a)\;(\frac{2}{3},\frac{1}{3}) \\ (b)\;(\frac{-2}{3},\frac{1}{3}) \\ (c)\;(\frac{2}{3},\frac{-1}{3}) \\(d)\;(\frac{-2}{3},\frac{-1}{3})\end{array} $