Consider the following three C functions :

$[$PI$]$ int $*$ g $($void$)$

$\{$

int x$=10$;

return $($&x$)$;

$\}$

$[$P$2]$ int $*$ g $($void$)$

$\{$

int $*$ px;

$*$px$=10$;

return px;

$\}$

$[$P$3]$ int $*$ g $($void$)$

$\{$

int $*$ px;

px $=$ new int;

$*$px$=10$;$.$

return px;

$\}$

$$ Which of the above three functions are likely to cause problems with pointers?