If \( \mathbf{A} \) is a vector with magnitude \( A \), then the unit vector \( \hat{\mathbf{a}}...

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If \( \mathbf{A} \) is a vector with magnitude \( A \), then the unit vector \( \hat{\mathbf{a}} \) in the direction of vector \( \mathbf{A} \) is
(a) \( A \mathbf{A} \)
(b) \( \mathbf{A} \cdot \mathbf{A} \)
(c) \( \mathbf{A} \times \mathbf{A} \)
(d) \( \frac{\mathbf{A}}{|\mathbf{A}|} \)
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