A compound shaft consists of brass segment (1)and aluminum segment (2). Segment (1) is a solid brass shaft with an allowable shear stress of 59 MPa. Segment (2) is a solid aluminum shaft with an allowable shear stress of 91 MPa. If a torque of Tc = 29600 N-m is applied at C,determine the minimum required diameter of the brass shaft d₁ and the aluminum shaft d2.