Plane that perpendicularly bisects a line segment

1. A.
   $x+y-z+1=0$
2. B.
   $x+y-z-1=0$
3. C.
   $x+y+z+1=0$
4. D.
   $x-y-z+1=0$

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1. A.
   $\bar{r}\cdot\left(-5\hat{i} - 3\hat{j} + 11\hat{k}\right) + \dfrac{135}{2} = 0$
2. B.
   $\bar{r}\cdot\left(\dfrac{3}{2}\hat{i} + \dfrac{7}{2}\hat{j} - \dfrac{9}{2}\hat{k}\right) + \dfrac{135}{2} = 0$
3. C.
   $\bar{r}\cdot\left(4\hat{i} + 5\hat{j} - 10\hat{k}\right) + 4 = 0$
4. D.
   $\bar{r}\cdot\left(-\hat{i} + 2\hat{j} + \hat{k}\right) + 4 = 0$

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1. A.
   $x + 2y - 3z + 2 = 0$
2. B.
   $x + 2y - 3z - 2 = 0$
3. C.
   $x - 3z + 2 = 0$
4. D.
   $x + 2y - 3z = 0$

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