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If A = (1, 8, 4) , B= (2, -3, 1) , then ...

If `A = (1, 8, 4) , B= (2, -3, 1) ,` then the direction cosines of a normal to the plane AOB is

A

A `2/sqrt(78) , 5 /sqrt(78), (-7)/sqrt(78)`

B

B `(2sqrt(10))/9, (7sqrt(10))/90, (-19sqrt(10))/90`

C

C `4/sqrt(218) , 9 /sqrt(218), (-11)/sqrt(218)`

D

D `2/11, 6/11, (-9)/11`

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