Four 20 mm diameter rivets join two plates of width 120mm and thickness 10mm. The allowable stresses in bearing of the plate and shearing of rivet are 100 MPa and 50 MPa respectively. The maximum safe load P (kN) that may be applied in shearing failure of the rivet and bearing failure of the plate respectively is _kN,____kN. a.) 40, 31.4 b.) 62.8, 80 c.) 80, 62.8 d.) 62.8, 20 P+ P+ O O H P P