Consider this function prototype: bool delFirst$($Node $($:$T$:${)}^{**}$& head$).$ What is the correct implementation?

a$.$

if $($head$==0)$

return $0$ ;

Node $($:$T$:${)}^{***}$ temp$=$head;

delete temp;

head$=$head$->$next;

$\frac{?}{\text{b}\text{a}\text{r}}($ return $1$; $)$

b$.$

if $($head$==0)$

return $0$ ;

Node $($:$T$:$)*$ temp$=$head;

head$=$head$->$next;

delete temp;

return $1$;

c$.$

if $($head$==0)$

return $0$ ;

head$=$head $$ next ;

$\frac{?}{\text{b}\text{a}\text{r}}($ Node $)(\frac{\text{:}}{b}ar(T)$:${)}^{***}$ temp$=$head;

delete temp;

return $1$;

d$.$

if $($head$==0)$

return $1$ ;

Node $($:$T$:$)*$ temp$=$head;

head$=$head$->$next;

delete temp;

return $0$ ;