A.  21x2+21y2+21z2-34x-76y+90z-2=0

B.  21x2-21y2+21z2-34x-76y+90z-2=0

C.  21x2+21y2+21z2-34x+76y+90z+2=0

D.  21x2-21y2-21z2-34x-76y+90z-2=0

Correct Answer :
21x2+21y2+21z2-34x-76y+90z-2=0
Explanation :
No Explanation available for this question
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