Identify the correct statements from the following: P. 0.2% yield strength of a material implies 0.2% of the yield strength. Q. Von-Misses yield criterion implies that yielding occurs when the distortion energy reaches a critical value. R. Radius of the cylinderical Von-Misses yield surface increases as the grain, size of a single phase material decreases. S. Tresca's yield criterion gives a circular cylinderical surface in the space of the three principal stresses.

Answer: Option B