Examine the following statements ___________?_x005F_x000D_1. Factor of safety for steel should be based on its yield stress,_x005F_x000D_2. Factor of safety for steel should be based on its ultimate stress,_x005F_x000D_3. Factor of safety for concrete should be based on its yield stress,_x005F_x000D_4. Factor of safety for concrete should be based on its ultimate stress._x005F_x000D_The correct statements are

• A. (1) and (3)
• B. (1) and(4)
• C. (2) and (3)
• D. (2) and (4)