thE FunCtions oF FBi ArE thE Following ExCEpt ______.
A．to invEstigAtE thrEAts to sECurity oF thE unitED stAtEs thAt tAkE plACE within thE u.s. BorDErs
B．to stop thE sprEAD oF Communism in CEntrAl AnD south AmEriCA
C．to protECt thE prEsiDEnt AnD viCE-prEsiDEnt
D．to CoorDinAtE intElligEnCE opErAtions