The complete expression for the decay of the radioactive hydrogen isotope tritium may be written as \({ }^{3} \mathrm{H} \rightarrow{ }^{3} \mathrm{He}+\mathrm{X}+\mathrm{Y}\). The symbols \(\mathrm{X}\) and \(\mathrm{Y}\) represent A. \(\mathrm{X}=\mathrm{e}^{+}, \mathrm{Y}=\bar{u}_{\mathrm{e}}\)

B. \(\mathrm{X}=\mathrm{e}^{-}, \mathrm{Y}=u_{\mathrm{e}}\)

C. \(\mathrm{X}=\mathrm{e}^{+}, \mathrm{Y}=u_{\mathrm{e}}\)

D. \(\mathrm{X}=\mathrm{e}^{-}, \mathrm{Y}=\bar{u}_{\mathrm{e}}\)