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