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If M denotes the midpoint of the line segment joining A(4 i+5j-10k) and B(-i+2 j+k), then the equation of the plane through M and perpendicular to AB, is

A

`vec r . (-5i -3j+11k)+135/2 = 0`

B

`vec r . (4i+5j-10k)+4 = 0`

C

`vec r . (3/2i +7/2j-9/2k)+135/2 = 0`

D

`vec r . (-i+2j+k)+4 =0`

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The correct Answer is:
A
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