Three rods of the same mass are placed as shown in the figure. What will be the co-ordinates of the center of mass of the system ?

• A

  $(\mathrm{a}/\sqrt{2},\mathrm{a}/\sqrt{2})$

• B

  (a/2, a/2)

• C

  $\left(\frac{\mathrm{a}}{3},\frac{\mathrm{a}}{3}\right)$

• D

  $\left(\frac{\sqrt{2}\mathrm{a}}{3},\frac{\sqrt{2}\mathrm{a}}{3}\right)$