Numerous nanometer$-$size spherical pores can be generated in aluminum subjected toneutron radiation. $($The questions below require yes$/$no answers. In either case, justify fullyyour answer$)($A$)$ The gas$-$free pores of question $1-1$ shrink and eventually disappear by diffusionof vacancies from the pores to sinks $($such as grain boundaries or the specimen surface$).$During this process, the vacancy concentration in the lattice is higher than at equilibrium. Dothese additional vacancies affect substantially the yield strength of aluminum measured atambient temperature? Yes$/$NO $.($B$)$ The pores of question $1-1,$ while they are present at elevated temperature,block the motion of grain boundaries associated with recrystallization. Does this particularmechanism $($prevention of recrystallization$)$ affect the yield strength of aluminum measuredat ambient temperature, after exposure to high temperature? Yes$/$No