Figure shows two identical particles 1 and 2 , each of mass m, moving in opposite directions with...

Figure shows two identical particles 1 and 2 , each of mass m, moving in opposite directions with same speed v along parallel lines.
At a particular instant, r⃗_1 and r⃗_2 are their respective
position vectors drawn from point A which is in the
plane of the parallel lines. Which of the following
is the correct statement?
(a) Angular momentum L⃗_1 of particle 1 about A
is L⃗_1=m v r⃗_1⊙
(b) Angular momentum L⃗_2 of particle 2 about A
is L⃗_2=m v r⃗_2⊙
(c) Total angular momentum of the system about
A is L⃗=m v(r⃗_1+r⃗_2) ⊙
(d) Total angular momentum of the system about
A is L⃗=m v(d_2-d_1) ⊗
⊗ represents a unit vector going into the page.
- represents a unit vector coming out of the page.

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