If the vectors \[(\hat{i}+\hat{j}+\hat{k})\] and \[3\hat{i}\] form two sides of a triangle, the area of the triangle is:

• A. \[\sqrt{3}\]                    
• B.        \[2\sqrt{3}\]
• C. \[\frac{3}{\sqrt{2}}\]   
• D.        \[3\sqrt{2}\]