A.

DECLARE
   CURSOR employees_cur IS
      SELECT * FROM employees;
BEGIN
   FOR employee_rec IN employees_cur
   LOOP
      do_stuff (employee_rec);
   END LOOP;
END;

B.

DECLARE
   CURSOR employees_cur IS
      SELECT * FROM employees;
   l_employee   employees%ROWTYPE;
BEGIN
   OPEN employees_cur;
   LOOP
      FETCH employees_cur INTO l_employee;
      EXIT WHEN employees_cur%NOTFOUND;
      do_stuff (l_employee);
   END LOOP;
   CLOSE employees_cur;
END;

C.

DECLARE
   CURSOR employees_cur IS
      SELECT * FROM employees;

   TYPE employees_aat IS TABLE OF employees%ROWTYPE
      INDEX BY PLS_INTEGER; 

   l_employees   employees_aat;
BEGIN
   OPEN employees_cur;
   LOOP
     FETCH employees_cur
      BULK COLLECT INTO l_employees LIMIT 100; 

      EXIT WHEN l_employees.COUNT () = 0; 

      FOR indx IN 1 .. l_employees.COUNT
      LOOP
         do_stuff (l_employees (indx));
      END LOOP;
   END LOOP;
   CLOSE employees_cur;
END;