If we overload operator $==$ for the class point as a nonmember function, which of the following implementations is correct?

Question $1$ options:

a$)$

bool operator $==($const point& p$1,$ const point& p$2)$

$\{$

return $($p$1.$x$()==$ p$2.$x$())$ && $($p$1.$y$()==$ p$2.$y$())$;

$\}$

b$)$

None of these

c$)$

bool operator $==($const point& p$1,$ const point& p$2)$

$\{$

return $($p$1.$get$\_$x$()==$ p$2.$get$\_$x$())$ && $($p$1.$get$\_$y$()==$ p$2.$get$\_$y$())$;

$\}$

d$)$

bool operator $==($const point& p$1,$ const point& p$2)$

$\{$

return $($p$1==$p$2)$;

$\}$