Which equation shows the $\beta$-decay of lead-209?
- A$^{209}_{82}\text{Pb} + ^{0}_{-1}e \rightarrow ^{209}_{83}\text{Bi}$
- B$^{209}_{82}\text{Pb} + ^{0}_{-1}e \rightarrow ^{209}_{81}\text{Tl}$
- C$^{209}_{82}\text{Pb} \rightarrow ^{209}_{83}\text{Bi} + ^{0}_{-1}e$
- D$^{209}_{82}\text{Pb} \rightarrow ^{209}_{81}\text{Tl} + ^{0}_{-1}e$