Three points A(0, 1, 1), B(2, 0, -1) and C(1, 0, 3) form $\Delta$ ABC. The ar ($\Delta$ ABC) is : (A) $\frac{\sqrt{53}}{2}$ sq. units (B) $\sqrt{53}$ sq. units (C) $\frac{\sqrt{11}}{2}$ sq. units (D) $\sqrt{11}$ sq. units