Figure shows an amperian path \( A B C D A \). Part \( A B C \) is ...

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Figure shows an amperian path \( A B C D A \). Part \( A B C \) is in vertical plane PSTU while part CDA is in horizontal plane PQRS. Direction of circumlation along the path is shown by an arrow near point \( \mathrm{B} \) and
at D. \( \oint \vec{B} \cdot d \vec{\ell} \) for this path according to Ampere's law will be :
(A) \( \left(i_{1}-i_{2}+i_{3}\right) \mu_{0} \)
(B) \( \left(-i_{1}+i_{2}\right) \mu 0 \)
(C) is \( \mu_{0} \)
(D) \( \left(i_{1}+i_{2}\right) \mu_{0} \)
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