3. The following photographs (a) and (b) are for two samples after tensile test showing their fracture surfaces a- Which one do you expect to be brittle and why? (2pts) b- If (a) and (b) are of the same materials but one tested at room temperature and the other tested at -50C, which one was tested at -50C? (1 pt) (b) C. Do you expect this material to have FCC or BCC? (1 pt)