$\begin{array}{1 1} (a)\:\frac{1}{5}(6\hat i+\hat j-7\hat k)\:\qquad\:(b)\:\frac{1}{5}(4\hat i+9\hat j-13\hat k)\:\qquad\:(c)\:\frac{1}{5}(\hat i-4\hat j+3\hat k)\:\qquad\:(d)\:None\:of\:these. \end{array} $

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