A solid circular bar of steel (G = 78 GPa) transmits a torque T = 360 N

Question:

A solid circular bar of steel (G = 78 GPa) transmits a torque T = 360 N ( m. The allowable stresses in tension, compression, and shear are 90 MPa, 70 MPa, and 40 MPa, respectively. Also, the allowable tensile strain is 220 ( 10-6.
Determine the minimum required diameter d of the bar.