A circle with a diameter of 200mm is scribed on an unstressed aluminum plate with a thickness of 20mm. Forces acting in the plane of the plate later cause normal stresses of 80MPa and 130MPa in the x and z directions, respectively. What are the normal stresses in the x and z directions on the aluminum plate? A) 80MPa and 130MPa B) 80MPa and 120MPa C) 70MPa and 130MPa D) 70MPa and 120MPa