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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 \( 2 a \). The magnetic field due to this.loop at the point \( P(a, 0, a) \) points in the direction is
(a) \( \frac{1}{\sqrt{2}}(-\hat{\mathbf{j}}+\hat{\mathbf{k}}) \)
(b) \( \frac{1}{\sqrt{3}}(-\hat{\mathbf{j}}+\hat{\mathbf{k}}+\hat{\mathbf{i}}) \)
(c) \( \frac{1}{\sqrt{3}}(\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}) \)
(d) \( \frac{1}{\sqrt{2}}(\hat{\mathbf{i}}+\hat{\mathbf{k}}) \)
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