Which of the following is true about pointers?

Which of the following is true about pointers?

Addresses are integers, so the following code is OK:

int $*$ p;

p $=250$;

Addresses are integers, so the following code is OK:

int $*$ p;

p $=0$;

If a pointer ptr is going to be used to point to a variable var, ptr and var can have different types

Addresses are integers, so the following code is wrong:

int $*$ p;

p $=$ NULL;

To let a pointer ptr point to a variable var, we use the "address of$"$ operator & as show here:

float var;

float ptr $=$ &var;

If a pointer ptr is going to be used to point to a variable var, ptr and var should have the same type