Which one of the following options represents the output of the program below?

struct pixel

$\{$ int c$,$ r; $\}$;

void display$($pixel p$)\{$ cout $<<$ "Col $"<<$ p$.$c $<<"$ Row $"<<$ p$.$r $<<$ endl; $\}$

int main$()\{$ pixel x $=\{40,50\},$ y$,$ z; z $=$ x; x$.$c $+=10$; y $=$ z; y$.$c $+=10$; y$.$r $+=20$; z$.$c $-=15$; display$($x$)$; displayYes; display$($z$)$;

return $0$; $\}$

a$.$

Col $50$ Row $50$

Col $50$ Row $70$

Col $25$ Row $50$

b$.$

Col $40$ Row $40$

Col $40$ Row $70$

Col $25$ Row $50$

c$.$

Col $60$ Row $50$

Col $60$ Row $80$

Col $25$ Row $50$

d$.$

Col $50$ Row $70$

Col $50$ Row $55$

Col $25$ Row $50$