Write the nuclear equation for the positron decay of C-11.
{ }_{6}^{11} \mathrm{C} \longrightarrow{ }_{y}^{x} ?+{ }_{+1}^{0} \mathrm{e}
{ }_{6}^{11} \mathrm{C} \longrightarrow{ }_{5}^{11} ?+{ }_{+1}^{0} \mathrm{e}
{ }_{6}^{11} \mathrm{C} \longrightarrow{ }_{5}^{11} \mathrm{~B}+{ }_{+1}^{0} \mathrm{e}