Question: Consider a firecracker that after being triggered explodes after 1 second. An observer A is standing some distance away from observer B who is traveling

Consider a firecracker that after being triggered explodes after 1 second. An observer A is standing some distance away from observer B who is traveling with constant velocity towards A with the firecracker. The velocity of B and distance between A and B is such that B will reach A in 1 sec as measured by A. At this instant B triggers the firecracker they are holding. Which of following options is correct.
a. The firecracker explodes exactly when B reaches A
b. The firecracker explodes before reaching A
c. The firecracker explodes after crossing A
d. All the above outcomes are possible

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