Explain in detail

Question: 29
M_x and M_y denote the atomic mass of the parent and daughter nuclei respectively in radioactive decay. The Q-value for a β^– decay is Q ₁ and that for β⁺ decay is Q ₂. If m_e denotes the mass of an electron, then which of the following statement is correct?
(c is velocity of light in vacuum)
Options:
$$\begin{gathered} Q_1=\left(M_x-M_y\right)c^2 \mathrm{and} Q_2=\left(M_x-M_y\right)c^2 \\ {Q}_1=\left(M_x-M_y-2m_e\right)c^2 \mathrm{and} Q_2=\left(M_x-M_y+2m_e\right)c^2 \\ {Q}_1=\left(M_x-M_y\right)c^2 \mathrm{and} Q_2=\left(M_x-M_y-2m_e\right)c^2 \\ {Q}_1=\left(M_x-M_y+2m_e\right)c^2 \mathrm{and} Q_2=\left(M_x-M_y+2m_e\right)c^2 \end{gathered}$$