Consider the following three C functions: [P1] int *g(void) { int x = 10;…

Consider the following three C functions:

[P1]
int *g(void)
{
   int x = 10;
   return &x;
}

[P2]
int *g(void)
{
   int *px;
   *px = 10;
   return px;
}

[P3]
int *g(void)
{
   int *px;
   px = (int *) malloc(sizeof(int));
   *px = 10;
   return px;
}

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