A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction [IIT-JEE (Screening) 2001]

• A.            \[\frac{1}{\sqrt{2}}(-\overset{{}}{\mathop{\hat{j}+\hat{k}}}\,)\]
• B.            \[\frac{1}{\sqrt{3}}(-\hat{j}+\hat{k}+\hat{i})\]
• C.            \[\frac{1}{\sqrt{3}}(\hat{i}+\hat{j}+\hat{k})\]           
• D.            \[\frac{1}{\sqrt{2}}(\hat{i}+\hat{k})\]