If [(0,2b,c),(a,b,-c),(a,-b,c)] is orth...

If `[(0,2b,c),(a,b,-c),(a,-b,c)]` is orthogonal matrix, then the value of `|abc|` is equal to (where `|*|` represents modulus function)

`+1/sqrt2,pm1/sqrt6, pm1/sqrt2`

`pm1/sqrt3,pm1/sqrt2,pm1/sqrt6`

`pm1/sqrt2,pm1/sqrt6,pm1/sqrt3`

`pm1/sqrt2, pm1/sqrt6,pm1/sqrt2`

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