A:{(x,y,z)|(x﹣1)2+y2+z2≤1}
B:{(x,y,z)|(x﹣1)2+y2+z2=1}
C:{(x,y,z)|(x﹣1)+y+z≤1}
D:{(x,y,z)|x2+y2+z2≤1}