Which of the following are potential problems when we assign pointer variables:

a) inaccessible heap memory
b) dangling pointers
c) uninitialized pointers
d) NULL pointers

a) inaccessible heap memory

If only one pointer points to allocated memory, and that pointer has is pointer value changed so that it points some place else, there is no way to access or deallocate (delete) that memory. That memory remains locked up for the life of the program.