The statement free(ptr); when used in the program does which of the following?

Question

The statement  free(ptr);  when used in the program does which of the following?

Answer

It deallocates the pointer variable  ptr  by releasing the 8 bytes.

Answer

Deallocates the stack or heap memory that ptr is pointing to.

Answer

It resets the pointer variable  ptr  to NULL.

Answer

Dellocates the heap memory that ptr is pointing to.

Answer

Even if  ptr  continues to hold the address of heap memory, it is illegal to now use it.

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