Which equation represents the process of $\beta^+$ decay? Key: $u$ stands for the up quark $d$ denotes the down quark $\nu$ = (electron) neutrino $\bar{\nu}$ = (electron) antineutrino
- A$ddu \rightarrow uud + \beta^+ + \nu$
- B$ddu \rightarrow uud + \beta^+ + \bar{\nu}$
- C$uud \rightarrow ddu + \beta^+ + \nu$
- D$uud \rightarrow ddu + \beta^+ + \bar{\nu}$