Which of the following is perpendicular to \( \hat{\mathrm{i}}-\hat...

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Which of the following is perpendicular to \( \hat{\mathrm{i}}-\hat{\mathrm{j}}-\hat{\mathrm{k}} \) ?
(A) \( \hat{i}+\hat{j}+\hat{k} \)
(B) \( -\hat{i}+\hat{j}+\hat{k} \)
(C) \( \hat{i}+\hat{j}-\hat{k} \)
(D) None of these
\( \mathrm{P} \)
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