In the structure shown, an 8-mm-diameter pin is used at A, and 12-mm-diameter pins are used at B and D. Knowing that the allowable load P is 60 kN. Determine the following; a) The shearing stress in pin A, b) The shearing stress in pin D, c) The largest normal stress in link BD, d) The bearing stress in the link at B. Top view -200 mm-180 mm- 8 mm- 20 mm P 8 mm 8 mm- DO D 12 mm- Front view Side view