Question 4:You are given a sample made of a multiphase material. This specimen consists of three individual grains[25 pts]:Grain A has a simple cubic crystal structure Grain B has a body centered cubic crystal structure Grain C has a face centered cubic crystal structureUpon applying a macroscopic stress of MPa, the specimen starts to yield. The grains seem to be oriented such that the loading direction follows the direction relative to grain A, direction relative to grain B, and direction relative to grain C.