Stresses in Two and Three Dimensional system

Q. The cross-section of a bar is subjected to a uniaxial tensile stress '$\rho$'. The tangential stress on a plane inclined at $\theta$ to the cross-section of the bar would

1. $\frac{\rho sin2\theta }{2}$
2. $\rho sin2\theta$
3. $\frac{\rho cos2\theta }{2}$
4. $\rho cos2\theta$