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In a half-subtractor circuit with $X$ and $Y$ as inputs, the Borrow $(M)$ and Difference $(N = X – Y)$  are given by

1. $M = X \oplus Y, \: \: \: N = XY$
2. $M = XY, \: \: \:N = X \oplus Y$
3. $M = \overline{ X}Y, \: \: \: N =X \oplus Y$
4. $M = X \overline{ Y}, \: \: \: N = \overline{X \oplus Y}$