Which of the following refers to the German military strategy where modern technology combined with speed and force to surprise and overwhelm their targets?

A$.$ Luftwaffe

B$.$ Blitzkrieg

C$.$ Aggressive Advancement

D$.$ Both A & C

President Truman decided to use the atomic bomb against Japan $*$

A$.$ Prolong the war

B$.$ To save American lives

C$.$ To test the bomb

D$.$ To prove an ethical point