Bismuth $\begin{array} { c } 212 \\83\end{array}$ Bi Is Known to Be Radioactive

Bismuth $\begin{array} { c } 212 \\83\end{array}$ Bi is known to be radioactive. The stability of $\begin{array} { c } 212 \\83\end{array}$ Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known: $\begin{array} { l } 4 \\2\end{array}$ He: 4.002603 u $\begin{array} { c } 208 \\81\end{array}$ Tl: 207.981998 u $\begin{array} { c } 212 \\82\end{array}$ Pb: 211.991871 u $\begin{array} { c } 212 \\83\end{array}$ Bi: 211.991255 u $\begin{array} { r } 212 \\84\end{array}$ Po: 211.988842 u The $\begin{array} { c } 212 \\83\end{array}$ Bi nucleus is

A) subject to alpha decay only.
B) subject to beta-plus decay only.
C) subject to beta-minus decay only.
D) subject to alpha or beta-plus decay, but not beta-minus decay.
E) subject to alpha or beta-minus decay, but not beta-plus decay.