A vector \( \vec{a} \) is turned without a change in its length \( ...

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A vector \( \vec{a} \) is turned without a change in its length
\( \mathrm{P} \) through a small angle \( d \theta \). The value of \( |\Delta \vec{a}| \) and \( \Delta a \)

W are respectively
(A) \( 0, a d \theta \)
(B) \( a d \theta, 0 \)
(C) 0,0
(D) None of these
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