Nuclide X with proton number $Z$ undergoes $\beta^+$ decay to form nuclide Y.
The decay may be represented by the equation shown.
$X \to Y{\text{ }} + {\text{ }}{\beta ^ + } + W$
What is the proton number of Y and which particle is represented by the symbol $W$?

1 )
A
B
3 )
C
4 )
D
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