Center of mass of two particles with masses 2 kg and 1 kg located at (1,0,1) and (2,2,0) has the coordinates of

Question

$$\begin {array} {1 1} (a)\;\frac{4}{3},\frac{2}{3},\frac{2}{3} \\ (b)\;\frac{2}{3},\frac{4}{3},\frac{2}{3} \\ (c)\;\frac{2}{3},\frac{2}{3},\frac{4}{3} \\ (d)\;\frac{1}{3},\frac{2}{3},\frac{2}{3} \end {array}$$