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Activity of a radioactive substance is \( A_{1} \) at time \( t_{1} \) and \( A_{2} \) at time \( t_{2}\left(t_{2}t_{1}\right) \), then the ratio of \( \frac{A_{2}}{A_{1}} \) is :
(a) \( e^{\lambda\left(t_{2}+t_{1}\right)} \)
(b) \( e^{\lambda\left(t_{1}-t_{2}\right)} \)
(c) \( e^{-\lambda\left(t_{1}+t_{2}\right)} \)
(d) \( \frac{t_{2}}{t_{1}} \)
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