The vectors `vec(a)=(2-x)hat(i)+2 hat(j)+2hat(k)," "vec(b) = 2hat(i)+(2-y)hat(j)+2hat(k)," "vec(c)=2hat(i)+2hat(j)+(2-z)hat(k) and vec(d) = hat(i) +hat(j)+hat(k)` are coplanar, then
A. `1/x+1/y+1/z = 1`
B. `1/(1-x)+1/(1-y)+1/(1-z) = 1`
C. ` x + y + z= 1`
D. ` 1/(x-2)+ 1/(y-2)+ 1/(z- 2) = 1`
