4. Each of the following definitions and program segments has errors. Rewrite them without errors. a. int x, *ptr; &x=ptr; b. int x, *ptr;B *ptr = &x; c. int x, *ptr; ptr = &x; ptr 100; // Store 100 in x = cout < < x < < endl; d. int numbers [] = {10, 20, 30, 40, 50}; cout