A.x+y+z+2=0 B.x+y-z+2=0 C.x-y+z+2=0 D.x+y+z-2=0
A.-x+y+z-4=0 B.x-y-z-4=0 C.x+y+z=0 D.x+y-z+2=0
A. B. C. D.