Delay execution of a command (say date command) for 2 minutes

Which of the following statements is false?

a) Dereferencing NULL pointers typically causes programs to crash. b) If a function parameter points to a value that will not be changed by the function, const should be used to indicate that the data is constant. c) Attackers cannot execute code by dereferencing a NULL pointer. d) None of the above.

Explain what a destructor is and why it cannot be overloaded.

What will be an ideal response?