As shown in the figure, the fixed straight rod at the left end is subjected to a torsion couple, and the torque at sections 1-1 and 2-2 is: <image 1>
['12.0kN.m, -3kN.m', '-2.5kN.m, -3kN.m', '-2.5kN.m, -3kN.m', '2.5kN.m, -3kN.m']