Figure shows two identical particles 1 and 2 , each of mass \( m \), moving in opposite directio...

Figure shows two identical particles 1 and 2 , each of mass \( m \), moving in opposite directions with same speed \( \mathbf{v} \) along parallel lines. At a particular instant, \( \mathbf{r}_{1} \) and \( \mathbf{r}_{2} \) are their respective position vectors drawn from point \( A \) which is in the plane of the parallel lines. Choose the correct statement.
(a) Angular momentum \( L_{1} \) of particle 1 about \( A \) is \( m v\left(d_{1}\right) \) \( \otimes \)
(b) Angular momentum \( L_{2} \) of particle 2 about \( A \) is \( m v \mathbf{r}_{2} \odot \).
(c) Total angular momentum of the system about \( A \) is \( L=m v\left(\mathbf{r}_{1}+\mathbf{r}_{2}\right) \odot \)
(d) Total angular momentum of the system about \( A \) is \( L=m v\left(d_{2}-d_{1}\right) \otimes \)
where, \( \odot \) represents a unit vector coming out of the page and \( \otimes \) represents a unit vector going into the page.