If a line has direction ratios <2,-1,-2>...

If a line has direction ratios `<2,-1,-2>`, then what are its direction cosines?

A

`lt2/3,-1/3,-2/3gt`

B

`larr2/3,-1/3,2/3gt`

C

`larr2/3,-1/3,-2/3gt`

D

none of these

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